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Evolution always seeks to create a population such that its goal is the proliferation of that species in the short term (in evolutionary terms) with no regard for the future.
Moral conscience is only beneficial to a species when the species exists globally such that there are little or no free resources. Only then is the greater good more beneficial to the survival of the species than the individual or the good of the pack/tribe over another pack/tribe.
However on the flip side intellectual evolution is an advantage even in very sparse populations with plentiful resources. Greater intelligence means you can harvest and utilize those resources more quickly and put them to use growing your family or tribe as well as defending it.
As such due to the nature of evolution moral evolution is doomed to always lag considerably behind intelligent evolution. Furthermore since evolution is, in human life span terms, a very slow process, it isnt something that should be expected to catch up until many generations, and a lot of death has passed first. Due to the nature of intelligence to enable us to find more effective ways of killing ourselves this can inevitably lead to a species destroying itself long before its moral evolution has a chance to balance the equation.
It is this reason that many scientists speculate why we dont see very many radio signals in space indicating alien intelligent life, the theory goes that the very nature of evolution is such that life will almost inevitably destroy itself once it reaches the intellectual singularity before it has a chance to become interstellar and as such simply doesn't have a very long time span where it exists in a state where it gives off radio waves.
Sadly we dont appear as though we are going to be much different in that regard.
