I don't know if this has anything to do with it at all, but a common thread I have been reading throughout this forum about roos that become aggressive starts with....."hand-raised, lots of affection, handled all the time, carried him around all the time, used to be our pet, let the kids hold him and pet him, spoiled him all the time,etc."
I've also heard that rams who were bottle fed and made into pets were a terror to have around upon reaching sexual maturity.
Maybe the key is that everyone is treating these roos with too much familiarity and a certain amount of disrespect comes with that. A rooster is not a pet, he's a male animal and as such is hormonally driven to do a few things very well....none of these include playing nice with kids, dogs, cats, etc. One wouldn't make a pet out of a bull and expect you could never turn your back on him, same with a billy goat....one day they get an idea to turn on you and it always hurts. I'd say its the same with a rooster.
Of course there are always exceptions, but not enough to make it a rule.
I don't handle any of my chickens unless I need to do so. Especially the roos. I want my chickens flighty....this means they are more alert and have a better response time with predators. I also don't want my roo to think I'm a push over, or beneath him in the social chain. ANY invasion of my personal space is rewarded with an advance towards him with a purposeful stride or stance. I don't respond with any rooster-like activities like flapping or crowing....I'm not a rooster and I don't want him even
thinking I may be. To him, I'm the alpha predator, top dog in the food chain. My corrections are quick and aggressive...not painful but they certainly leave a message:
I'm dangerous and not to be messed with.
I think kids of a certain age can be safely around a rooster, provided that kid is farm savvy and smart about reading animals. Kids shorter than a roo or only slightly taller are in danger, no matter what. They are vulnerable because their size makes them so, because they have young, uncertain voices, strides, movements. This makes them a target for aggression.
A "tame" rooster has forgotten that humans are predators and will take advantage of that if the notion strikes him.
Lesson: Don't treat roosters like pets or big parrots or even like your hens....they need to be somewhat aggressive to protect the flock, to breed vigorously, to be male. Give them their personal space, make them respect yours. $.02