Okay...After reading that the kid does sound like a POS, however, I still don't think he deserves to spend the rest of his life in a wheel chair.
It doesn't sound like the father was targeting guzzman with the gun, more using as a scare tactic, however, instead of letting cool heads prevail, and calling...ohhhh say....THE POLICE!, the father could have avoided potentially spending the rest of his life in jail, and sparing his wife and daughter the reprecussions of having a father, no longer able to provide for their lives, in prison.
I understand why the father was pissed, but its no reason to paralayze a kid, and even more so, it's no excuse to leave his wife and children paralyzed with the consequences of his stupid actions.