I agree he should have called the cops. However, good thing he had a means to protect himself. That is what is most important here. I hear people tell me all the time "having a gun in the home doesn’t mean you will make it out alive". My view on this is, that is true. It doesn't guarantee my safety, but it helps! I would much rather be able to at least defend myself then have no chance at all and depend on the police show up before some SOB makes it to my bedroom to do harm to me and my family. As far as an alarm system goes, I agree one is needed. I also believe the best alarm system is a dog. Dogs might not be able to protect you, but they can warm you. Those seconds may be all you need to gain the advantage.
My $.02
"Si Vis Pacem, Para Bellum"