I think all of us are the sum of our experiences - good bad and indifferent, hesabitdaft.
I probably did some good things when I was drunk - I can't remember any of them but the law of averages is on my side over twenty years when you were as drunk as I was day after day.
I don't think any good I might have done at all negates the harm or the bad things I did drunk tho - and there was a lot of that - nor does it change the fact I was killing myself as a drinker.
I'm not even sure I agree you saved someones life because you were drunk - seems to me you might have some special training and that kicked in in spite of you being drunk, not because of it...I think you saved someones life because you were there.
You can argue you were there because you were drunk - but hey, if we're gonna play what if, maybe you were there because you were meant to be?
D