The easiest way to show US govt. involvement in the terrorists attacks in America is to point to the anthrax attacks, since the anthrax used belonged to the US govt.
Anybody who says that's not strong evidence obviously shows themself a liar or a coward.

The habit of using the media-term "9/11" to refer to the terrorists attacks in America is a bad mistake, at best, since it cuts off the most blatant piece of evidence.