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I would say it's probably a space issue. When mine are penned up they fight more, but when they free-range or are out on pasture they get a long a lot better. That said, the bigger ones always pick on the littler ones, and the one darker colored one I had always got picked on by everyone.
Also, I realized that ones brought up in the same family (hatched and raised together) don't do it aggressively toward each other, but if you introduce a new turkey from a different family they go nuts trying to get it -- they can tell each other apart that's for sure.
I had young males that did that to each other and I think they are "practicing" for when they are bigger. It was cute for awhile because they would take turns doing things like sitting on each others heads (!) and it was funny. Then when there hormones started kicking in they got pretty aggressive about it.
Usually they fight but eventually work it out without getting killed, but I'm surprised all yours died. Their beaks are very sharp, though, and I know they really try to go after each other's head sometimes. You might have to have separate pens.
Sometimes what I do is make sure the ones getting picked on have plenty of places to hide and that there are obstacles so the aggressive ones don't always have clear sight. For example, I'll put haybales in a large pen that the turkeys end up chasing each other around or having to duck between the bales. It doesn't stop the problem, but I think it might give the weaker ones a slight advantage. I also make sure to put more than one feeder out in several locations so the weaker ones get a chance to eat and drink away from the bullies.