I don't know what to do. The hard part of me thinks that regardless of this, I should stick to my guns and keep contact minimal.
Listen to that part and stay away, there's nothing you can say or do that will help him.
I know people that roughly 95% of people who suffer childhood abuse become addicts/alcoholics. I know because that's why I was an alcoholic from my first drink (got sober in 1991). What I also know is it's up to the individual to get help (a shrink, therapy) and heal the damage. Only he can deal with the repercussion of abuse and alcoholism. And this time, go no contact.