Actually, I think its pretty much just Alex Jones. But a couple of callers on Medved's conspiracy show today were convinced of it, one.because of the type of weapon Lanza was using. Evidently this show was a rerun, but not from too long ago.
Like Medved says, to believe in a theory like t his, you have to believe that hundreds, probably thousands of people, would be complicit. Same is true for the moon landing conspiracy theory. I would also note that a lot of these people have professional licenses, would have taken oaths, have codes of ethics, etc. I realize that people like this do commit crimes, lie and do bad things, but his point is that you would have to have a lot of them in one place, at one time lying about the same thing.