You are assuming that they are human like you. I am convinced they are not. I don't know what they are but they do not have the same mental mechanisms to feel about things that most normal people would.

I watch a YT channel about stupid people in cars, but after watching it, I am convinced that there are other species or forms living amongst us that just don't have the same ability or desire to reason like average conscientious people. Just think of the Bolsheviks of the Russian revolution, how could those people do the horrors to their "own" people if not for the fact that they were NOT their people.

If you have no conscious it isn't a problem.