This was kind of how I took it. They lured him there with the idea of just knocking him around, not realizing Bargo would kill him. Then the Bargo punk shoots the kid and they all freak. But they do what he says, because they are afraid they're next. Same for the step-dad. He probably helped out of fear for his family. He looks like a tweaker to me, but who knows?
Bargo has two teardrops tattooed on his face. In many circles, this would mean he's killed two people already (not always, but could be). What would it be to him to kill more?
To (poorly) quote from Unintended Consequences "The first one is expensive. After that, they're all free."
I don’t buy it, there were 6 involved, you mean to tell me that 5 were so frightened of one little gangsta wanna be? They are all guilty!!
The Step father who was there while they were planning KNEW THE PLAN WAS TO KILL SEATH!!! This was PLANNED AND HAPPENED AS PLANNED!!