I do believe in Karma. Thus my favorite quote: "Be careful what you wish for". It just might come true!
What goes around comes around. Maybe not necessarily in our hands, or where we can see or know (for our peace of mind's revenge... whatever). It does, though. Just because we don't know that so-n-so that done this or that got his/her just "payback". Doesn't mean they didn't.
Too many times I've seen it happen. Sometimes to myself even!
Yeah! Karma is there, everywhere!