Thank you SOOOOOOOOOOOO much, everyone. This was nice to wake up to. Not only the excellent advice, but even the really bad advice ( that pretty much mirrors what I REALLY wanna go do.)
Some background - my kid used to run with these guys before he straightened himself out last year, got a full-time job, and began planning for college.
The girl's house was used for this, probably with the mother's permission (the mother came out screaming at me and the alcohol on her breath about knocked me over) but that's impossible to prove since the mother was gone at the time this happened.
By the time the police arrived there were only two guys at the house - although the dogs started barking in the back yard and the motion light went on so it's a good guess the rest were bailing out the back.
At first they denied calling him, but when I pointed out that their name was on our caller ID they said they'd called to tell him NOT to come over.
While they were kicking him one of them stole his pager. They apparently gave it back to the police later, claiming it "fell off". They had to go get it from elsewhere, which is going to be hard to explain in court if there were only the two of them. The police officer dropped it off early this morning while I was still at the hospital. He is supposed to come back at seven tonight to talk to my son.
Motive? I really believe that they thought it would be "fun". As I said earlier, my son's a recovering head injury patient, and isn't quite like other kids. He doesn't think like them and his disabilities are pretty obvious to anyone who's around him for any length of time. I think for them it was a case of "beat up the retard". Not that he is, but if they didn't know what his problem was and that it's physical the teenage mentality of some kids would bring that conclusion.
I am not surprised by the kids' actions at all. Kids are pretty much rotten when in a mob mentality. I AM surprised by the cop's attitude that my son deserved it and was at fault and that it was all just a teenage prank. Even if their story were true, that hardly explains why kicking him after he was on the ground was a necessity. The broken eye socket could only have been done by a kick to the head.
I think that when the police officer shows up I'm going to insist that he only talk to my son after I've had a chance to contact an attorney. Can I DO that??????????
Again, thanks for all your support and caring. One of the things that makes this harder is I know nobody in this town and talking it over - or typing it

- really helps.