Only an educated idiot would say horses are vicious.
Or someone who has seen mustangs on the range in the west.
Yes, they are vicious. Just watch a couple of studs fight it out over a water hole.
I’ve had mustangs take more than a little interest in me when I’d approach their favorite water holes. They’ll zoom in straight at you and veer off at the last moment, trying to haze you off.
Stallions CAN be dangerous
Some horses CAN be very vicious. One of my working companions had a stallion that only she could control.
One day a child was playing in his yard, the stallion, in a field next to the yard, went berserk, jumped the fence and tore the child to pieces. The father hit the door and shot the stallion dead, but the boy died.
I just came from my field where the stallion and three mares were, petted them wiped them down and fed them grain with no problems.
When young, the stallion did try to bite but we all worked that out of him real quick, and when I was young the horse I had tried to bite my sister. the horse left a big bruise on her forehead where the front teeth hit her head.