I hear this when I discuss why I believe government agents plotted and perpetrated the crimes of 9/11, for instance. Or when I say that Lee Harvey Oswald was framed and others shot President Kennedy.
The best way to deal with this unfair statement is to re-frame the issue: Maybe the secret is out and those who do not "know" the secret have not bothered to discover it.
If the secret is out, how does that help society?
It would change the way people discuss these topics. Those who support the government's invariable position that the government did not conspire to commit the aforementioned events or others, such as the successful coup of Chilean President Salvador Allende in 1973, would now be on the defensive. They could no longer tell people to "knock off the conspiracy talk."
Likewise, I sometimes hear that people who do not believe a certain way about religion will go to hell. The people who speak of this place of eternal fire never say that they themselves will go there and they insist that the place exists as they describe it.
Instead of taking their word for it, we can re-frame the issue: What if hell does not exist or exists in other way?
Hell could be what happens when a person loses their integrity, not just to the world but to themselves. It could be what one might feel if they had nothing to look for, as if the one thing they need in life will, like Godot, never arrive.
We can do and feel so much better when we refuse to let other people tell us that there is some "secret" that we do not know. Or that what we do know cannot be true because the other person does not think so. The truth does not come from the mouth of another; it goes through our own minds.