I have known a couple of guys over the years(I’m 63) that are perfectly fine people when they are sober. BUT get a little alcohol in their system and they become raging monsters.
One guy I used to work with would come in on Mondays with black eyes and bruises because he would get drunk and then challenge everyone in the bar to a fight in the parking lot. Got his ass whupped so many times he was finally banned from most of the bars in town...............
Yup
Alcoholism is a terrible thing