Well, if you bring "
karma" into it, killing is
DEFINITELY the wrong option, as it compounds into your (presumably) already large baggage. See, it's the whole "
you reap what you sow" thing, when you deal with this "
karmic" business. It's much more interesting (and agreeable to the universe) to have the person who has done wrong suffer through the same (or similar) hardships and realize the error of its ways. Not simply dying and having the chance to do it all over again.
As for "
self-defense"... I plead the fifth, Your Honor. That's a whole different can of worms. Let's just say that "
there are cases and cases" and leave it at that, shall we?