I do think there could have been more depth added, but let's be clear.
In the case of the guy at the grave, I for one have never heard that raider utter a word, so it's an assumption that they're not just coming down from a PsychoJet rush. I mean there's a shallow depression where they might have buried someone, but we really don't know for sure.
In the case of the Corvega crew, we have it on good information, and journal entries by some of the raiders themselves, that they are a band of killers, thieves, and extortionists. Yes, we are walking into their squatters den (It wasn't locked when I tried the door ) but they invited me with their killing and extortion spree. (R.S.V.P. Bring Your Own Bullets )
So you heard one talking about their little sister, ummkay, but maybe they just failed to mention how they also got her strung out on Jet and sold her to the local brothel! I mean, lot's of imagination is being used here to assume that what they are saying is just a small part of who they are and that the parts we don't know are probably not parts best described by showing a very short clip from the movie Hostel.
So, until I do get the chance to have a long chat with one of them and find out that in fact they could end up living out the rest of their lives manning a guard post at one of the many settlements I have helped established, than they will be dealt with like all those that choose to wear the social badge of Raider, with swift and mighty Justice.