When someone wants to debunk conspiracies, they say the conspirators couldn't keep things secret. Someone would tell. Here's an example from an article.
To begin with, none of the celebrated false flag experts can point to a single provable example of a thousand people staging a crime scene and keeping it secret.
What the author of the article wants can never happen because the author wants two things that contradict each other, a provable example that is secret. A provable example can't be secret. A secret isn't provable.