Thanks. You just proved two of my points
A Cessna weighing 1500#, traveling at 120MPH, and carrying 40 gal of fuel did not, and could not possibly destroy the World Trade Center. But you want to ban private flying anyway, apparently.
If you're honest, you might ask yourself why you hate freedom so much.
And you might ask yourself how a Secret Service agent hearing about an unauthorized aircraft detected on radar will know whether it's a Cessna (which of course could be loaded with explosive or WMD) or a 757/767.
Your weak agenda isn't helping much in this case.