Bob Fry wrote:

It was very
easy to see how a few hours of flying lessons in a C-172, plus a few
sim hours, would be enough to cause 9/11. That, and months or years
of deliberately going mad to commit suicide.

It is not "going mad.." it is being indoctrinated from birth to
hate or disdain all other religions, sects and nationalities but
your own. These people make the KKK look like boy scouts.