9-11 was an inside job

Why on earth did the Secret Service allowed the President to remain at Booker school that mourning for some 45 minutes after the 2nd attack took place on the WTC?? Its their job to get him [President] out of harms way immediately. They didnt do that. They KNEW they and the President were safe somehow or they would have been on Air Force 1 and out of there pronto...because nobody at that time didnt know if 50 planes hadnt been hijacked--and if one was heading for Booker school where the President was that mourning. The President would be a great target for a terror attack, right?