I saw the HBO documentary on this case as well. And from what I recall there was some evidence linking these "kids" to the murders. The problem the one kid (Damien Echols, I think that was his name) had was he acted like it was no big deal. He gave the impression that he wasn't scared and had no worry about being convicted. It made him seem arrogant as if he was trying to defy the prosecutors. It made him look guilty, whether he was or not.
I thought the most interesting thing about this case was the fact that this kid Damien answered some questions that favored the prosecution. In a backroom scene his lawyer asked him why he answered that way and he said "I was kind of zoning out up there. I wasn't really paying attention" (or something like that) and he was laughing about it. His lawyer just looked at him and said something like "Well, it's only your life we're talking about here. I guess that's not important enough to stay awake?" in a disgusted voice. It was just amazing how this kid is being accused and tried for a murder he says he didn't commit, yet he doesn't even care that he is helping th prosecution make their case because he's bored. If that was me, and I had nothing to do with it, I'd be nervous as hell on that stand. I sure as hell wouldn't be falling asleep or day dreaming.
The other kid he was tried with didn't seem the type to kill anyone, but he was so quiet and frail he might have just gone along with this Damien kid, who seemed like the type who might try something like this. He claimed to be into Wicka, yet he had all sorts of black magic symbols on his drawings and in his writings. Not to say this makes him a murderer of course, as anyone who listened to Iron Maiden or Slayer as a teenager (as I did) could be accused of being a murderer. But his defense was really weak.
Honestly, I wasn't there, and I don't know that they killed those kids, but from what I saw in the documentary I can't say they didn't do it either. That Damien kid definitely has the demeanor and personality you would associate with a sociopath. He just didn't care at all what was going on.
I'll tell you the one thing I thought was really shitty about the defense: They tried to make the one kids step father a possible suspect inorder to raise doubt in the jury's mind. They actually accused this guy (in so many words) of being the one who killed the kids because he had a brain tumor. I thought that was pretty low.
Anyway, Silent, you should see if you could get a hold of that documentary. It is a pretty good portrayal of the events and I think it would make you question this a little more. Like I said, I don't know if these kids really did this, but I can't say for sure that they didn't either. I saw their website and wasn't convinced of their innocence.