The kid fought them when a reasonable man would have stopped and said, “What the f-u-c-k do you crackers want?” They were not correct in their assumptions before instigating the interaction, therefore, they are responsible for what happened after.

That said, in a more normal case, they would have gotten a plea deal for manslaughter or something like that and THAT would have been much closer to justice than what they received. These guys are going to get sentenced like hardened criminals, killers, when they really were just a bunch of dumbfricks. In fact, probably only one of them was actually really stupid. He is the one who got out of the truck and did the shooting. The others were kind of along for the ride.