When we take mind altering drugs our minds get altered. If I am in a grocery store and they have a case of doughnuts I can be completely sober and still have a desire to snag one and eat it but because my moral compass tells me it is wrong I don't. When we drink our moral compass stops functioning and there is no stop button. We just do whatever we want regardless of other people or consequences.
I have done horrible things drinking but for the most part have forgiven myself because I don't drink and am not that person anymore