Disclaimer: there is nothing implied by this question, you can really just answer one way or the other and be on your way without thinking too deeply about it.
The scenario:
--You're about to graduate from college or grad school
--You have a job lined up that can go places. it's not a dream job, but it's not dead end. stable.
--you're engaged with a girl who you're currently in love with. No guarantees that you stay together, but as far as you can tell it seems fine.
--No debt
--You have stability in your life and into the upcoming years
then OH FUCK:
--You are somehow given hard proof that the Bush administration orchestrated 9/11 to attain some screwed up end! I don't have any details about how that happened, but that's not important. The fact is, you, just you, got this info and you now have the opportunity to break the story.
--Everyone will believe you because you somehow have hard proof. Shit will undoubtedly go down, but you have no idea how the world will react.
--This is the only opportunity for this info to ever get out. Ever.
So what do you do?
Do you:
--Continue on with your life, which seems like it'll be good (from your current standpoint.) There's no special incentive other than that. As I said, life just goes on normally and you have the same chances of getting divorced/cancer/raped by tauntaun as everyone else. You may have to carry the knowledge along with you, but the one opportunity to break the story will pass and once it does, you know that no one will believe you if you suddenly start claiming it later.
--Break the truth to the world, not knowing what'll happen. but hey, the truth will be out there.