I will admit that I don't know a whole lot about Karma .. but I do believe in the few things that I do know.
One of those things is ...
What goes around,
comes aroundAnother is ...
What you give,
will be returned to you ten fold.
So just perhaps this is why evil begets evil
And we need to start sharing all the wonderful things we all want to have around us ... so it can be returned to us ten fold.