If we're relying on evidence and some form of the scientific process - this is maybe what makes people feel threatened - then the best idea WILL win.
We just have to keep talking, analyzing, and testing... and give every hypothesis a fair shot.
People try to bend the stakes to (emotionally? persuasively? abusively?) help their favored idea or moral.
But you don't need to do that. Accurate statements eventually win, just naturally.
I think we've all seen situations where the lie prevails. And that's part of the fear. Communist Russia. Nazi Germany. Many debates, probably.
But if people are trained to analyze ideas right, accurate statements will prevail.
"Magna est veritas et praevalet." It's in the Bible. I wish people understood it.
"The truth is great and it prevails."
It's usually quoted in Latin because actually it isn't in all versions of the Bible... it's a disputed line, ironically.
It might be the truest damn thing in the whole book.