I believe in it somewhat, I still have a few people on my Rambo map(in the r/w) that still haven't seen the righteous retrobution they so richly deserve, but it seems karma is at work.
Unfortunately for mankind....
His or her impetus often springs from guilt over pleasure or self-pleasing. Therefore retribution must be part of the admonitions.
When we are children we are taught the value of "the effect of Karma" from our parents in many forms and carry it through our adult lives.
I think it is a harmless force as long as we don't let it dictate our lives. Some pleasures do not carry the weight of guilt and should be enjoyed fully as is our right and gift in life.