The beauty about conspiracy theories is that #1 the government can never release documents that disprove a conspiracy theory (because they're the government and

The beauty about conspiracy theories is that #1 the government can never release documents that disprove a conspiracy theory (because they're the government and clearly those documents are an effort to further the cover up) - and independently released information that doesn't align with the theory could always be a government plant - thus see #1. Fervently believed conspiracy theories die out with their believers or when people get bored.