Personally, I very much enjoyed the ability to hate them, to hit them, etc., and then let them live, because like. Nobody would expect you to forgive someone who cut off your arm.
It's one of those things where I find the 'I hate your guts and in any other circumstance I wouldn't tolerate you' dynamic so interesting. But other things matter more to my MC in this case, and they don't want to just be the big scary murderer.