He seems to lack critical information over the standards of 'RP' set by GSF in his absence, which you can't really blame the Vagos for.  That's on his boys, and that's on him for not inquiring into the precise details of what occurred while he was away.   Green's have done virtually the same thing, multiple times over to both the Vagos and LB, in very short periods of time, to say nothing of the house cleaning.  

Beyond that, I can't speak specifically to GSF because I don't watch them as much, but I've seen LB and Vagos gun down hood NPC's just because...so that's not very uncommon either.