Sounds like one of those Neighborhood Watch types with a Charles Bronson fetish. Good riddance.
The man was in is own yard, not the street, but his own land. Maybe you've never had to defend your own property against those you perceive as thugs, maybe when confronted you'll surrender your property without a struggle, and maybe if you try exercising and defending your Fourth Amendment right of being secure in your house/property someone would think before employing that "good riddance" technique.
"Pops says whatever you do out in the street or over on the side of the fence, that is your business, but you're not going to bring it in this yard."