I'm sorry to hear that, and good luck with finding a new place. Hopefully things work out better in the long run.
I don't get the unlocked door thing... if a door has a lock, I'm going to use it, even out in 'safe' rural areas. Not locking doors in Oakland is, well... I think that alone is a statement on your roommates level of responsibility/awareness.
Might be worth checking with a lawyer to see if you could make a case in small claims court. If you don't have access to a lawyer, the Oakland Public Library has several times a month where you can meat with a lawyer for like 10-15 minutes to ask questions, etc.