Everything is ok except for "stealing from thier own brothers", of course they must be instantly kicked from faction for that. Other, like killing innocent, stealing from anyone else but BoS, robbing bases, tent, raping brahmins, killing children, taking drugs and suicidal exploding with dynamite and shout about GM abuse is ok for BoS member, as they aren't knights in shiny steel power plates, they simply want to keep all technology to them, and make everyone not reach that technology, thier patrols should kill you if you're holding plasma rifle, but they don't, that's what could be changed. BoS won't care if someone was captured by raiders or slavers, BoS won't care if you'll kill whole town (if only you done it with some high-tech item, then they will find you and kill you and take that item), BoS won't care if you're killing children (if only you're not melting them with plasma), BoS won't care about anything, if you're not doing hostile actions towards them or have possibility to do (have something high-tech and very dangerous), if you not, you're nothing for them and they don't care about you.