An interestings scenario. I agree that opening the door was not the best move. However, I don't think the electronic fortress of doom is necessary either. If I don't want to answer the door, I just don't. If the guy starts jiggling locks, I'll have a glock in one hand, and my cell in the other. Step one call the cops if he persists. Step two, withdraw to a defensible position if he appears to gain access. I'm all in favor of good locks and an alarm. I particularly like the beeper that alerts if a door or window is opened to wake you up. I'm not sure that cameras and intercoms are required. If you know the guy is there, well, thats what the gun and phone are for, yes?
FQ13