Well, there is a heck of a lot of truth in that. I've been robbed twice (lived on the East side of Milwaukee for many years). First time almost got me killed because I didn't have my wallet or my gun. Second time it happened was a few weeks after that. Ended up bagging myself a bad guy with a stolen piece (turns out it wasn't loaded either). I was able to do exactly (more or less) what Boar described, and was able to restrain the guy until the police showed up.
Didn't get a lick of grief from them in regards to my 45. They simply arrested the guy, confiscated his weapon, recorded the serial number of mine, and then gave me a ride home.