@Kurai AssassinHow would they know? SOLDIER was disbanded and destroyed. Furthermore, SOLDIER had performed equal if not greater crimes towards the Purge.
There's no logical reason for anyone except Freelance to have a problem with the Purge. They're literally working for the government to fight a threat that makes terrorism look like a sunday stroll. The Purge is currently part of the American Military, a specialized individual branch that exterminates vamps.
I mean, the Director totally has reasons to go after the Purge. So do the agents, they were presumably wronged by the Purge during the Night Wars. But the Purge aren't doing anything particularly evil, or worth rebelling against. They're literally making everyone safer.