Where do you draw the line? If your job is to slap people, or just verbally abuse them, throw smaller stones at them all day, it's okay, because it's not genocide?

It's tiring to do the good thing, it's possibly impossible for every human, then some are put on 24-hour shifts, and some are even aware of their limit in this regard. Then the argument becomes "but he needs the money". And this is the same moral issue (like when doctors are on-call after a full day shift and do 30+ hours and suprise-suprise errors start to happen, when we overburden bureucrats, judges and other public servants and they start to fail on diligence) that should be addressed by society.