Because it's not like there's not a cost, or an inherent danger in attacking someone of being..idk.. Attached back? If you watch animal attacks you'll notice deer or bear can be scared of by a human with a stick and loud voice, not because the animal is in any disadvantage, but bc of the uncertainty of human capabilities and the rising certainty of dying from severity of injury,(bleeding out, predation, infection) makes the cost not worth it.

And you know, most people simply aren't like that. We are pro-social. Post-apoc there is nothing that has more value than another person. No gun, no tool, no vehicle. Another person expands capabilities and capacities across the board, as well as helping keep your sanity. So, sorry, I'm not afraid of people. I already rape and murder exactly as much now as I want to, and that amount is zero.

Those that say without religion blah blah blah fucking terrifying me and yet I'm glad their chosen book keeps their inner demons at bay.