My house was broken into with the alarm blaring. It's happened to a couple of my neighbors too. Someone pulls up they smash in the front door. Then spend about 30 seconds rifling through the house looking for valuables and then get in their car and run. The security system did nothing but make noise, and yes the cops were called. So what. Even if they would have been able to react immediately they would never have been able to get here in time.
So I put up some cameras in places outside, totally visible in areas that you can't walk around behind them. I have a small linux based home server/backup system that is built into a cabinet downstairs anyway, so I put zoneminder on it. If someone actually enters the house I get a message, and I can call the police. But it doesn't happen. No one wants to walk up in front of the cameras, and yes I know they could wear balaclavas or some crap, but they can't walk around the neighborhood like that without someone calling the cops, and the whole idea is to be inconspicuous.
There is no sure fire cure, and anyone who really want's in will get in. The idea is to make it more difficult than it's worth.