Do you think 9/11 was a conspiracy? The US government has outright denied it since this theory has come into being, but there have been numerous signs that conspiracy theorists claim show that 9/11 was a "false flag operation", meaning that the US government knew it was going to happen, but let it happen anyway. One of the main, most solid theories is that the US government needed public support to wage a war in Iraq. What do you think?