I really don't believe in "karma". Let's face it, there are people in this world who never really "get what's coming to them". At least not in this life. I'll leave that up to Someone much more just than I will ever be. However, when someone really sets out to inflict harm it is somewhat gratifying to see it backfire on them.
This week I had someone come after me (and mine). In a really interesting way. But you know what? It backfired on them. Big time. And the effect that they were looking for? The opposite happened in my heart, and some things were really confirmed for me.
It's like the story of Joseph in Genesis. What man had intended for evil, God is using for good.