If the governments of the US and England perpetrated the events of 9/11 (and the 7/7 bombings), the biggest tragedy is that the many people will hold the preaching of injustice regarding these events in the highest regard. This means that the believer of such conspiracies (true or not) have been given the impossible job of convincing the majority to believe and take action against something so flamboyant and severe, that the feasibility becomes less viable every day that the masses remain unconvinced. The pursuit of justice in the matter of these most tragic events will call out the most passionate and zealous of all to attempt to educate people on this truth. This could be an intentional neutralization of threats on the part of the government, effectively erasing all injustice within the system past, present and future. This is because the people that comprise the biggest threats to government are fighting an event that has eclipsed all past, present and future injustice (save another horrendous event). The most passionate opposer has effectively become a slave to a government mandate to fight something impossible to win against within his/her current paradigm.
The task of convincing people that their own government has killed many of their own people for selfish gain is rejected by the common ethos that permeates the US. If we are to convince anyone of anything we should fight the smallest battle we can think of. If people cannot motivated to take action against the smallest (ergo, the most believable and acceptable) infraction, how would it be feasible to convince someone to take action against such a sinister and cataclysmic event?
Right now the most important thing to do is reverse small scale injustices within our system. Thought I do not think it will be successful because the most zealous and unyielding are wasting time fighting the war unsuccessfully, and not the battles which will enlighten the common man in order to amass a formidable army. Then perhaps we will be ready to take on something large scale.