Or, maybe, 'Despite if it hurts'?
But yeah, somehow other people's misfortune is always funny.
And it isn't hard, or unexpected, to be a cynic.
Cynical isn't hard to achieve for a sadist.
It's a pretty tough pill to swallow initially (going from optimist to pessimist, hopeful to cynic) if you once were one of those said optimists, and had a rather bubbly personality in the past; many misfortunes later, and being on the ass-end of many a joke or attack later, that same bubbly person can easily become the most deflating (and sometimes outright terrifying) cynic to ever walk the Earth.
Sad to say, I speak from experience. However, it is rather entertaining if you encounter any past sadists that have caused such transoformations when you disguise yourself as the old personality, to see if they changed their ways at all (provided you recognize them); they don't change, then the personality 180 you can pull can be a rather entertaining sight, especially when you see their reaction as if they let loose a monster, and there's no way to stop it.
Sort of an observation I have made: "There's no scarier sight than to witness a saint climb out of Hell; especially if you put them there."
So to put it, if there's a particular person that has caused a ton of agony in a rather kind innocent person's life, just for the hell of it (you know, standard bully/sociopath); to have that same kind person that wouldn't harm anything just go up and nearly pulverize everything in his path as he charges towards you (or imply such if they're the non-violent kind). To be the one responsible for letting that beast out, my advice to that person is "run". Never underestimate a kind person. Or as Tropes would have it:
Beware The Nice Ones