I ask myself the same sometimes and this is what I come up with.
What do I have to lose if I try to drink in moderation? Potentially a lot, I told myself that I would never drink again and would never change my mind, does moderation fit in with that statement? I could lose my sobriety, end up on another binge and end up regretting it for weeks.
What can I gain from moderation? Nothing, most of the attempts to rationalize moderation are fallacies, and it boils down to a desire rather than an actual need. My life will not improve if I started to drink in moderation, there is nothing that alcohol can offer me that is of genuine benefit.