Karmic Agent

"What goes around comes around ... but it's gotta come from somewhere!"

I think the idea here is that, as long as you are a knowing agent of karmic justice, then you can do a crappy thing to someone without muddying up your own karma - you can even do it with vengeful glee.

But good things go around and need to come around, so if you really want to work for karma, you're much better off throwing money and gifts and goodwill at the good people. That way, if there are any karmic consequences to your act - well, lucky you.