Earlier quoted context omitted.
Theres no need to guess, we can just look to before it was prohibited. And it was alcohol that was worse. Most people don't care to use it (heroin) at all let alone regularly. Opiates cause nausea and retching in most areas drug abuse levels.... Alcohol was far more popular and consistently harmful... Just ask the wives of the time what they'd rather thier husbands use....
Alcohol is a potential catalyst and not a cause in these situations. There are underlying problems with people's psyche that lead to abusive outcomes. Add in centuries of religion supporting and encouraging the beating of wives and children who don't submit it's no wonder we as a species ended up where we are. Even Ghandi who was teetotaler hit his wife. Point being, like anything, it's complex. Yes, alcohol is a fac…
I say this as the grandchild of an alcoholic. Alcohol is the problem. You're right that there're underlying things, but they lie there, just beneath the surface, mostly untouched and undisturbing without alcohol.