It crossed my mind that here, people tend to keep a number of turkeys together with everything else, and rarely have problems with aggression. The birds are just left to get on with it, even though there´s a high death rate among the poults. But maybe that helps, as they´re in a more natural environment just out in fields.
I would view the killings of poults as a symptom of an issue. Under a more natural circumstance, excess violence is something always avoided. Only when two very well matched individuals are unable to 'argue' hierarchy dispute into a solution does a serious fight occur. Even then killing is more abnormal than normal under a wild situation.
Many people think in the wild it's all kill or be killed, since that's the popular idea we've been taught since childhood, but that's actually based on half truths and ignorance; you would have seen in many documentaries etc that there's a huge amount of behavioral body language and form, modifications, "safety mechanisms" etc that enables mock threats and display of dominance or submission without ever escalating to a violent interaction. Roosters are a good example of that, being so showy, just as with toms; their very showiness is generally a good indication with any species that most of their 'battles' will be ritual and stylized posturing, not resorting to actual physical violence.
Fights to the death are rare and bullying to the death is rarer. It makes no sense under natural circumstances for adult males and females, who have an adequate food supply, to waste precious time and energy, and risk life and limb, to destroy one another or young birds which are no threat to them.
I believe these are all extremes of behavior humans have bred into them under intensive farming, since the majority of all these examples occur only under our husbandry.
Lack of full spectrum nutrition combined with overcrowding and disintegration of the natural family unit contributes to this, as even the most antisocial species will congregate in vast numbers, without violence, when food supplies are rich enough. Giving kelp or a higher nutritional supplement than just the cheapest one you can buy is one way to trigger this complacency. Forcing them to overpopulate an area without complete nutrition triggers the depopulation instinct. Drought and a high burden of disease also triggers a survival instinct that propels some to leave the flock or home area, or drive out or kill weaker individuals. But these are circumstances of high duress, not representative of normal behavior in well catered for animals.
This is off topic but is why I believe we must select against aggressive non-peaceful males and females; they are usually only so aggressive and violent purely because they are lower grade genetically than the more peaceful animals.
Removing neurotic or hyperaggressive animals is necessary because for the animals, male and female, that are unable to gain alpha status though rights based on intelligence and strong genes, excessive violence is another method of attaining social dominance and therefore passing on their genes. They are not the best stock and cause losses of production, life, time and finances due to the stress and damage they cause. Such lower grade individuals can continue to "succeed at the breeding lottery" by breaking social rules and being extremely violent.
This has been shown in studies on cattle and deer, antelopes, etc. As I've mentioned before, the Australian cattle industry has found and proven positive correlation between a male's levels of aggression and his lower fertility. More fertile and healthier males are almost always calmer and more peaceful. (Exceptions would have to be made in breeds humans have developed for fighting, obviously).
In many studies of wild animals as well as some on domestics, lower grade males are more aggressive and do a lot more fighting but sire a lot less offspring, and their offspring are sired on lower grade females, and in turn these offspring will almost certainly never attain alpha status. They are born lower grade. The alpha hinds produce the future alpha stags, and they seek out a certain grade of stag to breed with and won't accept a lower grade one no matter how hard he tries to isolate her from other males. His extreme aggression is partly a method of trying to attain higher grade offspring, by trying to isolate a female above his grade. The best mares produce the best stallions, and the best stallions in turn produce the best mares, and the cycle repeats. The best stallions do not produce the best stallions, and the best mares do not produce the best mares. This is pretty well known and is another example of the complicated breeding systems in existence.
Due to the preference of the public for watching such primal battles as one sees between lower grade males, documentary makers focus on finding such footage as that's the moneymaking shots, and most people think all males are like that in the wild, it's "the male that fights the most that is the best and gets the most offspring". The truth of animal breeding is far more complicated than that. Occasionally you will see two top males fighting but most fighting you see is between lower grade males.
You can see in some documentaries and studies that certain females always refuse whatever male is considered by humans to be the "harem-master". Theoretically this should not happen at all. Yet it does. These are the higher grade females in general, playing at genetic superiority and exclusivity by being very picky about their mates. In general the females are chiefly in control of genetic strength or weakness in their offspring because they pick the best males they can and have internal mechanisms which destroy or eject sperm from males who are not a good match, etc. (Not commonly known although it's been documented for decades now... Some science news sites have info on this if you want to research it. Basically every species has sperm selection and destruction mechanisms in the females, even humans). Males are usually less picky about their mates than females, which makes sense since reproduction for a male is a very short isolated incident that doesn't directly threaten his life or take anything significant from him. So low grade females are better able to upgrade their family line than low grade males.
A low grade female stands a better chance of breeding with a high grade male than a low grade male does of breeding with a high grade female, and a female's intelligence and instinct levels more directly impact on her offspring than the father's as her diet and behavior directly influences her offspring's survival and health, and so females have a better chance of improving their genetic output than males do. Hence their frequent reticence about mating with just any male. A sub par male though can really only resort to excessive violence as a breeding strategy, although I must say I have seen some males work the same trick (securing an 'up-market mate') with extremely good "husbandry" of their chosen mate. A lower grade male can sometimes woo a higher grade female in which case one might view it as intelligence triumphing over weaker genetics and improving the future stock.
Anyway, this is such an unpopular version of reality that we still publish the preferred concepts of animal breeding and social structure, (alpha male takes all and it's all kill or be killed) but I've studied animals all my life and the truth of their behavior and breeding habits are not as simplified as the mainstream beliefs.
It's somewhat exasperating to me that so many believe only a good male is violent and only a weak male is peaceful, as this is untrue, and these beliefs continue to shape what genetics and common behaviors predominate in our flocks. I would not tolerate excessive violence as this is not actually natural. Fighting is natural but only within reason. If it descends into killing there is a deeper reason that must be sorted out. In my experience and opinion, anyway, and I understand a lot of folks believe the exact opposite. Time will tell.
Ok, I've gone way off topic, as usual haha, but anyway this is part of the reason I keep saying excess violence is NOT natural and should be culled out.
Best wishes.