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2.
A baseless and insulting pseudo-justification for an unqualifiable, destructively irrational, frequently stupid, and nearly psychotically paranoid assumption of the mass culpability and inheirently evil, antisocial character of an entire community, group, society, or world.
Everyone everywhere is assumed to be crazy and evil and must be inspected and watched at all times, with any suspicions real or imagined reported immediately because we live in a post 9/11 world!
by Esmith512 September 11, 2007
 
1.
George W. Bush's justification for all proclamations and decisions that would otherwise be seen as treasonous, detrimental, unsubstanciated, or wrong.
"We live in a post 9/11 world, it is maybe possible that Saddam might be capable of obtaining weapons that could be of mass destruction. So we must invade Iraq."
by MBB January 07, 2005
 
3.
A political buzzphrase used as a rhetorical talking-point in a power-grabbing or liberty-destroying attempt to diminish or subvert the civil libertarian, responsible, and democratic character of a community, group, or society.
The honoring of civil liberty, presumption of innocence and good faith, privacy, and freedom of speech and expression cannot be tolerated because we live in a post 9/11 world.
by Esmith512 September 11, 2007