>I get it, I'm an older brother, I would wanna go ballistic too. But the fact that these guys skipped over "notify the police" and went straight to "seek out in-person confrontation" is insane!

Unless you have independently evidence (that can be independently verified) of a better than misdemeanor crime police almost certainly aren't gonna do squat other than put you on a list of "people with motive" to check up on when the dude you're after gets shwacked by someone else he's wronged.