This would be bad strategy if they really did want people to accept them fully, but they don’t. They want to remain the World’s Most “Oppressed and Misunderstood”, coz that’s the weapon used to beat the rest of us with. Ergo, this is the best strategy.
Seriously. There's no ally they won't happily burn for a minor infraction. Ostracizing everyone who's ever had a kind thought towards them is a poor strategy.