Human DNA is garbage. Generally speaking, we're too selfish and stupid to handle organizing peaceful coexistence, especially relative to the level of advancement we're capable of. Look what happened when we figured out fission. Our whole 'civilization' is principally based on systemic violence. Earth is like The Planet Of The Apes. We are like monkeys with grenades, or babies with razor blades.
I would not be surprised to learn we are a left-over discard hybrid species originally designed and bred as a slaves, or to be harvested for something, ..science project maybe?