Glad to hear it V!
...and, hey, if your roommate starts slacking on keeping the doors locked, or starts saying you are paranoid sit him down in front of this thread. It's definitely full of great examples why you are anything but paranoid.
Actually, I think we witnessed the best example yesterday... During the afternoon, a man that was waiting for his ride home on the sidewalk got stabbed, right in front on the entrance of the building Roommate and I work in, by some random guy. The entrance that we use every day. Before, all the doors in the building were unlock during working hours, but a security guard was standing right next to it. Now, ALL doors are lock all the time; we need our access card to get in. Maybe now he'll get the point. By the way, the victim is okay.