Who would those be? Alanna, Amaury, Koli and Malus have to be included, and I can think of at least a dozen more with deep-rooted reasons to hate him.
Katerina, Franz, Ramiel... anyone who purported to be protecting Koli. To say nothing of Lurians who might be tired of the endless cycle of infighting and cannibalization. Brom certainly didn't get that ball rolling, but he's been instrumental in most of it. How many rebellions is it now, four? How many people have saved Brom's neck, only to see him repay the favor with betrayal? Perhaps that's a knock against those characters as much as it is Brom, but he has conditioned people to assume the very worst about him. There's also the very OOC matter of whatever agreement the player had with Matt. You don't commit to something with another player and then abandon that agreement when events don't go your way. Not if you believe in being a good sport.
All of this isn't meant to discourage someone from playing the kind of character Brom is. However, one should expect characters (and players) to react accordingly.
