actually there is a huge difference between the police, with powers authorized by state law, who are professionally trained, subject to internal disciplinary review, and supported by a legion of professionals who write the rules and procedures they use to do their jobs... and a neighborhood watch.
if you can't tell the difference between the two, well, let me just say it's a good thing you're not in charge of anything important, though it's a bummer you can still vote.
he didn't just follow the kid either... he acted like a vigilante, getting involved... though I guess that depends on whether you believe his story. Martin - heavily armed with skittles and iced tea - decided to jump him and try to beat him to death... just because well... you know kids these days!
He's not innocent in this thing. Most people see a guy following you and was armed, guess what - they would go home. Being followed isn't an excuse to beat a guy up. And you make it sound like the kid was just quietly walking the streets. How do you know? I have no idea what transpired but neither do you..