Automatic robotic perfectly memorized scripted to go into action. The carrion do the job they are there for.
I must say they do it excellently. They don't skip a beat or miss a thing. The fault lies in the dead and the "living" will never stop hounding them and attacking them and mocking them.
Perhaps it is inevitable that this should be. Compassion is not a thing that comes naturally to homo saps apparently. What is far easier is insulting attacking blaming denigrating vilifying humiliating those who cannot fight back. They are very very very good at that. Well trained OBEDIENT DEPENDABLE UNAVOIDABLE. here is something to be said for that. Isn't there?