Can survival of the fittest accomodate morals?

Those who believe Evolution as fact push the agenda that man has evolved along with all other animals and mankind is just another product of evolution "another animal".Since rape, murder and poligamy is common in the animal kingdom and I dont know of any case in the animal world where biological science considers that any animal which uses either rape, murder or poligamy in order to pass on its genes unsuccessful.For example, lions murder the cubs of other lions and then rape the lionesses when they take over a new pride, rape is common in Dolphins, yet all this is considered as a positive natural process in the eyes of biological science.My question to the Athiests/ Evolutionists is why can rape, murder and poligamy in the animal kingdom be seen as natural and successful in the eyes of natural selection for all animals, but why does science exclude homo sapiens from conducting such behaviour? why are those people who rape and murder put in prison instead of respected, such as the strong lion? why dont we imprison other animals which commit such acts? isnt this a double standard?Can you please explain this contradiction in these scientific beliefs?Since homo sapiens follows a completely different moral code to the entire animal kingdom is it possible that humans fit outside the order of the rest of the animal kingdom? Could this mean we have a different origin? a unique purpose?

You are taking what I have said out of context, maybe I've failed to explain myself properly or perhaps you are just on an immature ego trip.