There won't be anyone who has mobile phone footage of events inside because they weren't around then. There wasn't, as far as I'm aware, routinely recorded surveillance at the time. Because of that no one can prove what they say is fact, so it becomes I said/you said and the best option in that...
What does he expect, really, does he think anyone is going to just roll over and say "Yep, that was me, I caused the death of 96 people, my bad!"? Anyone who is being threatened with the responsibility for this are going to defend themselves.
One thing that they will do is draw into question...