The difference between conspiracies and conspiracy theories:

[Paragon]

http://www.wordiq.com/definition/Conspiracy_theory

Because conspiracy theories rely on allegations of covert action, they are frequently difficult to support with evidence. For this reason, the expression conspiracy theory is often used pejoratively to refer to allegations that the speaker considers unproven, unlikely, or false.

Thus Iraq, WMDs, etc. etc. are NOT "conspiracy theories" proven to be fact -- they were never true in the first place, and there was evidence before Bush made war as such. The media and the right wing chose to ignore it.