What's "rational persuation", anyway? Is a person supposed to already possess an ability to change their mind according to an agreed-to-be-safe protocol? Teaching rationality and then giving your complex case would be more natural, but isn't necessarily an option.

The problem is that it's possible to persuade that person of many wrong things, that the person isn't safe from falsity. But if whatever action you are performing causes them to get closer to the truth, it's a positive thing to do in their situation, one selected among many negative things that could be done and that happen habitually.