I am struggling with the 'why's and how's' of drinking right now, so I totally understand your examination of the different explanations. It is all over the place, and somehow never completely satisfactory. My resolve to quit drinking remains strong,though. It is not affected by the explanations for why I drank in the first place.
It shouldn't be something you need to sort out before you decide to stop drinking. I think it's a red herring. Ignore that for the time being.
You know yourself whether you should stop. Be really honest with yourself: what is the best decision for you - to keep drinking or to stop at least for a little while?
Decide what is best for you and treat yourself kindly, remembering that you deserve the best.