Yep, and the same holds true for the alcoholic. I've seen many people stuck trying to "figure out" why they drink, what happened that makes them the way they are.
And it doesn't make a lick of difference WHY someone drinks alcoholically--that understanding isn't a prerequisite to recovery, and knowing WHY doesn't change anything about what you have to do to recover. There's a reason that Step One talks about "admitt[ing] we were powerless over alcohol--that our lives had become unmanageable." Nothing in there about understanding why.