Considering that a lot of house robberies take place during the day when no one is home, hardening the perimeter is another option. Replace the standard door screws in the door frame and hinges with extra-long ones, and replace the standard face plate on the door with a long one that goes almost the length of the door. This makes it very difficult to kick a door in, and the intruder will likely give up to avoid detection. Windows can be hardened any number of ways that go with your architecture.

Be nice, until it's time to not be nice.