9/11 conspiracy theorists: how do you explain this?

The best conspiracy put out by the government was Roswell, N.M. in 1947. No government would flown a hazardous, uncontrollable weather balloon over any part of the country. It was a UFO, but the government felt that too many people could have panicked, so they changed their original story. In 2008, even the Pope said, "We should accept the fact that there are other civilizations". Google, Vatican observatory.