Life is never fair. And there's no karma, no paying for your sins, and no rewards..
But in reality life isn't have a compromise, there have a karma about what you do now and get your result at others day. And as we believed in every religion that someday in the judgement day we must paying sins that we make when we life, and also get reward to send our to the heaven. I believed it, so from now I always try to be good people that God will.
Thanks for sharing @corina