@Nomad416 same. Arthur just doesn’t seem like some sadistic psychopath. He can do what he believes he has to do but he takes no pleasure in hurting others.
Actual psychopaths in the gang would be: Dutch, Micah, Cleet, Joe, Sean (he chatted and joked with that plantation worker on the carriage one moment and then didn’t hesitate to kill him in cold blood the next)…I’m not sure about Bill.
I think pretty much everyone else has some level of empathy and believes/believed/wants to believe in Dutch’s Robin Hood BS.