Another reason being that it's not so widely known (Literally, you need to be told since infocards don't mention it either) so entering Liberty with your new Ranseur ready to destroy Liberty capitals can enrage some oldtimers/elitists that will try to kill You while excusing themselves with a years old treaty most don't even remember.
And then there's the problem that people welcome you when they're getting ganked and push you away once there's no enemy.