NPC by definition cannot do the same kind of backstabbing as PC.
imagine some exaggerated scenario:
election with candidates A, B, C
candidate A bribes XYZ, XYZ takes the money, don't tell everyone, but went ahead to vote for B/C because they are in some secret society together or what not and uses the gold to bribe someone else to vote anyone but A.
doing something similar with npc would be a bit complicated, no?
dealing with npc tends to mean they won't screw you. taking your money and running away, sure. failure, sure. but not really screw you. they don't have memories, hold grudges and what not. and that's a very ooc thing.
But they can call you out, and then *everyone else* will remember.
