Arabic al-qā‘ida, the base : al-, the + qā‘ida, foundation, base, feminine participle of qa‘ada, to sit.]
http://www.answers.com/topic/al-qaeda
Making up propoganda and crashing planes into buildings are slightly different. Lying about WMDs is easy enough to do because the average American citizen doesn't go to Iraq and doesn't investigate the claims.
You are right about the repeating things over and over again does not consititute proof. Your argument is living proof of that.