SOMEthing to THINK about.
Humans have no problems with killing people. Raciale differences come in handy to legitimize it. Suppose the target is not the human you know, but a different species.
Around 20.000 years ago the Neanderthal-people seemed suddenly to have disappeared out of the fossil-records. Their existence on our planet is archeologically proven from 150.000 years ago. But we have to realize that only forty-or-so incomplete skeletons have been found in Europe (Spain, France) and the Near-East (Israël). Was it the first genocide, performed by our ancestors.
Evolutionists see it as a step forward.