One of the best ways I have heard addiction described is that it is a physical addiction paired with a mental compulsion. Both of them have to be addressed. If you just go dry, the complusion is still there. If you go to AA or counseling but still continue to use/drink, you're no better off. I do think there is a genetic component to it, but that is an explaination, not an excuse.
But in the end, the reasons don't matter. As my old Al-Anon sponsor used to say, "PurpleSquirrel, you would try to think your way out of a burning building. Who cares WHY its burning -- just get the hell out!!"
I don't need to know why my XAH is an alcoholic. I don't need to hear about his pain, his issues, his problems. I've got enough of my own to deal with.