You cited a source that misrepresented the role of foreigners here for whatever reason and the number of deaths they have caused.  Certainly you do not question the existence of the 9/11 hijackings and destruction.  Most likely you do not deny that the 9/11 hijackers were non-citizens here on visa's from other countries.  So there is nothing for me to prove.  You gave a quote that you selected to present a false impression.  Some people call this lying.  The fact is that non-citizens here on visa's have killed many.