This type of hijacking would not have succeeded on El Al. Heroism on the flight that crashed in Pennsylvania prevented that plane from crashing into the White House offices. We should encourage and teach self defense. Our war against guns has created a victim mentality. Pilots have heretofore been taught to comply with hijackers, as consistent with our victim-mentality war against guns.
Guns enable self defense and deter criminals.
If a foreign nation harbors or supports terrorists, America should dismantle their government if possible. Nations bear full responsibility for any act of war perpetrated by their terrorists. We should not just punish such a terrorist government. If possible, we should destroy that government. This will help deter future governments from supporting terrorism.