I would rather we take a stand now and not wait for the next attack and maybe having 6000 people die in that one.
It would appear that you are assuming that the WTC collapsed as a result of the planes crashing into them. Please note that this assumption is not supported by the physics involved in the collapes. The physics clearly show that they were controlled demolitions. More information here:
These types of events are known as "false-flag" terrorist attacks, that is, attacks that are fabricated so as to help induce cultic psychology on a population, including mass-hysteria, removal of civil liberties, scapegoating of internal minority groups, militarism, a culture of fear, control of information and suppression of dissenting views. Examples from history include the fire in the Reichstag in Germany which allowed Hitler to consolidate his power to become a dictator even though he never had the majority of the popular vote.