We can all agree that chickens are not horses, or cattle, or hogs, etc. BUT there's a lot of history with them! Bottle raised bulls, stallions, or whatever, are much more likely to be very human aggressive as adults, because of their ambivalent species identity issues, and their lack or respect towards humans, and often, they just don't relate to their own species normally either. Individuals raised with a normal herd; young, adults, mama, and older males, are likely to be more 'sane', or whatever you want to call it.
Roosters raised in an adult flock are more likely to be better boys too,, and they learn early not to hassle the big adults! They also need to learn that humans are not chickens, and not part of the flock 'pecking order'.
Mary