Any kid, especially one that is as big as a pro football player, that comes knocking on doors with mischevious intent after dark is asking for trouble. Period.
What do you think the punk did once unsuspecting folks opened the door? Smile and introduce himself as a neighbor?
More than likely, he did something that was intented to scare the hell out of the homeowner, which probably involved the threat of some use of force.
The homeowner had the smarts to get a CCW permit so he could defend himself. He also has the smarts to not be talking to press. He's done two things right, while the only thing the perp has going for him is that his worthless family thinks he a "good kid that didn't deserve to die". We've only heard their side of the story, because the homeowner is very wisely not talking to the press.
Also, the police did not arrest the homeowner. That should tell you something also.