I haven't done anything for that wiki Akusai put together, so I thought I'd lay out a thought here for critique and approval: One of the foundational assumptions I find in a lot of woo is the idea that a giant, "Perfect Conspiracy" is possible.
A Perfect Conspiracy is the idea that a staggeringly large organization can carry out complex operations without leaving any evidence of their activities. This clearly violates Occam's razor by positing two new, unnecessary entities: The activity and its coverup. These entities are typically unnecessary because the conspiracy theory usually exists to explain why everything looks like there was no conspiracy: If the conspiracy theory is true, the predicted evidence is the same as the predicted evidence if the conspiracy theory is false.
Additionally, there are many costs that make such a conspiracy implausible:
Money for materials, tools, etcetera, to perform the operation.
Money for false evidence to cover up the operation.
Money to collect and conceal or destroy evidence of the real activity.
Money for silencing potential whistleblowers through bribes, assassinations, and threats.
Money for paying willing members or people willing to work without being paid.
Time and planning to ensure the activity and the cover up don't leave evidence behind.
Time for logistical planning.
Time and money to quickly conceal or discredit leaks that do occur in the information age.
Time and money to silence experts who find inconsistencies in the cover story.
In order for the conspiracy to remain hidden, the masterminds must know almost absolutely how every potential leak will react: They must know for certain that they assassinate those who cannot be bought or threatened. They must know for certain that those they pay off will not later confess anyway. They must know those who they threaten will not grow courageous enough to speak out.