For another comparison do a Google image search of "Arnold in his prime". Now imagine seeing a dude who looks like that and being told "be careful, that guy has no concept of human laws or morality, he won't go out of his way to kill you but if he did it wouldn't bother him one bit. Also he doesn't speak English.".

I think most would be pretty unlikely to just walk up and run their fingers through that dude's hair. But Arnold in his prime only weighed 240 lbs. An adult male bison can weigh anywhere from 1000 to 2200 lbs.