How many people believe that what you do has some sort of come back? What goes around comes around?
That if you do good, it will come back to you sometime somewhere?
That if you do bad - it will rebound on you - sometime - someplace?
Is there a cosmic force that brings about some sort of justice and balance in the universe we live in?
Or is there nothing? No cosmic justice for those who got none in this world? No recognition for the little bits of good you do when no-one sees? No come-back for the evil?
I think the only 'comeback' happens/doesn't happen is when you do something that affects the survival of your genes.
as for the Cosmic this, that and the other : what is that exactly?
From experience at the practical level, I know that if you do someone a good turn, they are far more likely to do you a good one in return. Conversely, if you do 'em a bad one, not only will they do you a bad one in return, they will actively gang up on you with all the people you've pissed off to do you an even worse one. That's what I call instant Karma!