You can't talk an alcoholic into becoming sober. He has to figure it out for himself. He has to have so destroyed his life that sobriety is all he has left. It's literally tragic that you can see it coming and know there's nothing you can do about it. If from a distance you see a man walking backwards over a cliff there's nothing you can do to save him. The cliff is too far way. Your voice won't carry. You know what's coming. You can time it. But you can't do anything about it.
Trump voters are like that. Backing over a cliff, drinking themselves stupid on his mendacity: a mendacity that is impossible to expose because it has never been hidden. His lies are so numerous, so obvious, and so dangerous that, though he does everything short of starting his speeches with "by the way, don't believe a word I'm about to say, staring with my next sentence," he can't get his followers to hear him. It would be comical in a movie. In life it's frightening and sad.
They'll learn. Or they won't. There's nothing you can do. I saw a Trump ad that ended, "All she's interested in is money, and power, and herself." The main problem with the claim is that NO ONE could possibly believe that sentence applies to Hillary and not (infinitely more aptly) to Trump. But no one is laughing. He's stripping himself naked in public daily and pointing his finger at his opponent and saying, "Look at that shameless woman without any clothes."
If you talked to them, they'd ask you for facts. But they don't recognize facts. They visit Breitbart, and Fox News and all of your Right Wing bullshit sites and then ask you for facts. Keep your facts. Facts mean nothing to these people. A fact to a Trump voter is an empty glass. What's the point? You can't get drunk off that.