You know he's trustworthy with a popped up collar like that.
If Grace really wanted good karma, she'd shoot all the escaped convicts, and that isn't some horrifying political statement on my part. Karma is one of your stats in the game, and killing members of a gang known as the Powder Gangers is considered good karma. Grace, who is trying to be a goody-two-shoes by not killing anything, will most definitely have neutral karma at best for a while.
Which, given the previous comic, is probably totally fair.
Fallout New Vegas is possibly unique among Fallout games simply by virtue of there being a governing body somewhere with an actual correctional system. I say "possibly" because I've never played the first two games, and I'm fairly certain said governing body was in at least one of the previous games, but my point is that wasteland justice is more commonly "you've done wrong, so we're going to shoot you."