Bulls do kill

Bulls do kill people with some frequency, but when they do they're almost never trying to kill; they're challenging the person for dominance. Bulls don't kill each other when they're fighting for dominance, but because a bull is so big, and because bulls use head butting to win dominance contests, the human get crushed against a fence. The bull doesn't understand how much bigger and stronger he is.

Temple Grandin: Animals in Translation