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How can you even open a dialogue when someone is clinging to something that is just factually wrong? The claims are outrageous, but when you point out the facts and try to insert some rationality in the conversation, they either refuse to listen, refuse to believe anything that doesn't reinforce their view, or claim that they have a "feeling" or they "just know".
Unfortunately you can't reason with people who don't even believe the concept of reason.
We just have to move forward with or without them, its not something we should even worry about, unless they start acting out violently (which some will do). We just have to hope that most will acclimate to a reality-based reality eventually.