Mel Gibson has daughters, right?

I found this comment sort of interesting:

Overheard in the neighborhood chocolate shop/cafe today:

Her: I don’t drink because I do terrible things when I’m drunk. Once this guy was hitting on me, and I pushed him through a plate glass window, head first. Nothing happened though. And I say all these racist things! Only when I’m drunk. But when I get drunk I just…say anything. Is that part of me? I don’t want to be a racist, so I don’t drink.

Is the decision not to drink accomplishing much here? Does the individual have a moral obligation to do more?