The Taurus Judge is a terrible choice for anything other than a range toy. 410 will not achieve necessary penetration - even with shells marketed as defensive. It is a gimmick. If you want to shoot the venerable 45 Long Colt cartridge, you would be better served by any of a whole host of 45lc specific Rugers or S&W revolvers.
Nothing about a 410 or a shotshell "spread" makes it effective against carjackers. A striker fired polymer 9mm with at least 15 rounds of hollow points will be more effective in terminal ballistics and more psychologically effective 10 out of 10 times.
If this guy parks a block or three away and starts dropping looters with headshots, the odds of him being prosecuted for murder are far greater. Tactically sound, but extremely difficult legal defense as he can't claim the all-important "fear for my life" leaving his lawyer to only argue that he "feared for his livelihood." I know which I'd rather argue.
Regardless of his views, that's a stupid fucking Meg Griffin hat.