Yes, there is no hard evidence proving it (that wasn't covered up), so taking a public position on that topic is foolish and risks damaging your reputation. That said, he's probably not educated about what happened. There's no hard evidence, but there's an overwhelming amount of circumstantial evidence between lucky Larry Silverstein and his double insurance payout, the israeli "art students" who were connected to the mossad being allowed in the towers, the dancing israelis, building 7, israeli companies getting advanced warning 2 hours before the attacks, jews mysteriously "calling in sick" that day, etc. There's also the fact that our government and media is owned by jews, and they did everything they could to paper over the truth.