Spend some time looking into the OKC bombing. That this was a sting gone wrong is incredibly possible. It doesn't have to be the way it happened, but certainly toward the top of the list of what really happened. There were government agents involved all over the place, and this has been proven in court. They either knew it was going to happen (possibly with their own involvement?) and thought they would stop him at the last minutes, or they knew about it but didn't have enough information as to when it was going to be, or they had government agents all through this group of people yet somehow didn't know about it. But several government agents that were undercover in the group have testified in court that they warned the FBI about a plan to blow up a federal building, so there is no way they didn't know about it to some degree before hand.
Let's say this time had went south and this guy was able to set off his bomb. Would the FBI admit they had been working with him? Or would they go into cover up mode...and everyone on here badmouth Alex Jones when he points out obvious holes in the official story? I actually can't stand Alex, but from time to time, a conspiracy theory turns out to be true.