OK: first, what do we learn about Eric? He has superpowers to find them in the desert without owning a vehicle (apparently, since we can't know if he didn't park next to the Jeep.) Or he got a ride from his cronies.
In any case, how has he gone on performing criminal activities such as drug dealing (actually, this is the first time we hear about him peddling drugs, though by now if he was selling radioactive waste to terrorists, we wouldn't be too surprised, would we?)
He's nervous, as CJames pointed out by highlighting the added line. So he could be frightened of his accomplices; in which case, if they gave him a ride, why don't they help him out in disposing of Steve and Chris? If they need the password, they'd all be there, with a laptop to make sure they get the good one... And once they get it, make sure they'll never be bothered anymore.
Maybe he's in a hurry: some deadline (drug delivery?) is coming up, and Eric needs to clean things up before he beats it. The most puzzling thing, and maybe where we've been misled by CJ's relentless "industrious tyke" chanting, is Eric's possible number one position in the crime ring. What if when he was in the "custody" of the Piedmont sheriff, he actually managed to get control of the guy (he might know a few dirty little secrets about him).
So there is no doubt left as to Eric's evil side. I can't believe he's being watched by Thaddeus/ PS as he 's taking care of Steve and Chris, and he's willing to let them die. Were he watched from far away, there's always a way to let a little slack in the rope so they might escape after a while. But apparently, he's willing to have the boys grill in the sun.
With CJ's gloating over reality not being what it seems, we should really try to outwit him by drafting a possible scenario of what's going on behind the scenes. A secret passage in the bookstore; Thaddeus hijacking the LVPD computer (or is there a mole in the LVPD?); Eric putting up a porn website hosted overseas; Eric in the drug business; the Piedmont sheriff willing to kill Chris (and Steve). How does this all tie up together?