Could 5% of humanity be a psycho-path-subspecies?
These psychopaths are basically leeches on the rest of us, maybe even a cancer. Not only do they feel no guilt for enslaving other (wage-slavery), but they are also fine with poisoning the body and the mind (too many to list).
Perhaps they can even identify others with the same causal DNA segments. Sight? Smell? Micro-movements? Perhaps they really do see all non psycho-path-bearing-DNA-offspring as worms. Perhaps they intentionally breed with each other to avoid spreading the gene to vasts numbers of people.
Could this explain the vast majority of suffering?