ultra violent I think that's a lovely character idea, and at this moment I have two points to make:
1. I do not think there's any formal or informal rule about characters that cannot be former members of radical organizations. I mean, if it were unallowed then several established toons who have their own criminal empires and routinely use excessive violence would also stand on shaky ground. Also, Requiem protagonists are cannibalistic walking corpses who have to restrain themselves not to get homicidal on a nightly basis, so there's that.
2. I'd be very careful about that bored/snobbish attitude. That is not to say your character must be a social butterfly that considers small talk their favorite pastime, but if you project an aura of "don't talk to me, I don't care" this is exactly what will happen, just like in real life, and we won't be able to get to really know what drives your radical chic, which I believe would be a loss. Also, consider that vampire society is extremely hierarchical and keen on etiquette, so there's good chance someone will take offense and ash you, Carthian or no. As a closing point, a lot of fun this site provides stems from social scenes, and see above: if no one wants to scene with you, that's a loss for both you and us.
I'm doubly excited to see you in play, because IIRC the Movement has been virtually gone from Sacramento for a long, long time.