I think most people know that. But there's a group that seems to think otherwise, so looks for every little scrap of information (or lack of information) to support their fantasy. Part of the problem, and part of what feeds them, though, is that the investigation after really was pathetic.
I would agree. There was nothing to cover up to the extent that eots and Lookout are referring, but information was most likely covered up anyway because someone in their infinite wisdom thought there were things we just don't need to know. This of course would give the impression that something more nefarious then what actually happened took place.