Cell phones were not new in 01. Not all of them had cameras, actually if memory serves few did. Even so, actual cameras still existed, digital and film. Where are the pics and video?
A minute percentage of the public walked around with a camera in 2001. Now virtually everyone does. It's idiotic to expect everything to be videoed or photographed during that period.
It's idiotic to think that there were massive celebrations and yet no documentation exists. It's idiotic to think that the stations that supposedly aired such a newsworthy event have no records of it. It's idiotic to think that the police wouldn't have been called.
In otber words it's idiotic to believe Trump
There's plenty of documentation. As I posted in another thread, an FBI agent said they received countless phone calls about Muslims celebrating. There are numerous other examples of people reporting celebrations. You simply choose to ignore all the evidence. Unless you see some video from a network news outlet, it's not evidence as far as you're concerned.