I don't shoot raiders. I've killed 1 in a couple hundred hours. To me, this isn't a COD or Battlefield. I use my mic and say im friendly. I tell them immediately that I won't fight them. It's gonna be up to them on what kind of human behavior they wish to exhibit. I'll go out of my to help others bc that's the kind of person I am and the game play I wish to portray. Ultimately it's the Raiders against the Arcs. Anything outside that is a behavioral choice. I don't get upset when I get shot in the back while looting something or killed walking inside an elevator. I get disappointed in humanity a little but it makes the very few good interactions that much better. Performing an act like killing someone when they are defenseless or not a threat is in my eyes poor behavior.
