How many homeowners kill armed burglars/criminals entering their homes. How many homeowners owning a handgun are killed by armed burglars/criminals? What you just wrote was like something straight out of a Hollywood script.
That was one example, how many others do you want to go through? If you are scared of somebody entering your home, lock the doors and install a security system. Buy a box of CS gas and you should be very safe. Confront criminals with guns and the odds are very good that you or your family will be hurt/killed. How many criminals have entered your house or visited your friends homes while the owners was home?

Criminals always have the advantage. Usually by surprise, but also in mindset.