Cool.. I can see your point. Yes, the morally ambiguous do 'seem' to get ahead because a person willing to do anything for their advancement or benefit will do things even OUR society would condemn as immoral and in many cases illegal. They will survive.
But I contend, "It's not enough just to Survive, one has to be Worthy to survive!"
A Morale system of right and wrong, Justice and Punishment is what has lifted mankind, 'mostly', out of savage barbarism & anarchy and given rise to civilization.
We do not have cultures centered around human sacrifice on top of pyramids anymore do we? Why.. because a morale compass has told us such societies do not serve the greater good of mankind as a whole.
I contend weather one believes or disbelieves in a 'God' watching an judging from above that a morale society is a much more stable and superior society than one bereft of such. In fact I feel that every social advancement our race has ever made is because of a strive to be a morale and justice-minded species. There are indeed a glut of profoundly Amoral people out there who would slit your throat as soon as look at you... but society in-general makes such misanthropes outcasts at best and criminals in common.
Am I postulating some 'inherant' goodness to mankind? Far from it! We are constantly driven by greed for more than we need or deserve... but ... taking the religious tact, we also know what is good and evil.. and we know we should be moral beings.
We are souls.. with the spark of divinity from our divine creator, made in his image... we are NOT just animals who can talk! We are held.. and should hold ourselves to a higher moral standard than just... me first, survive at all costs!