The other guy being "drunk" and in possession of a weapon....?
Let's just say that the drunk would not have the advantage...plus...his actions "could" be justification for use of deadly force...and I said "could".... Again..we can play whatif all day.
I do agree that deescalation of all deadly situations is the correct course.
I was thinking of the drunk the same way you are, and imagining him dead over someone's breakfast not being quiet enough. A little more premptive deescalation in the world, sort of like defensive driving, could save a lot of lives.