Then keep doing it. You going, "hey, that's not correct because of reason X, Y, and Z" will likely stop anyine reading to take the side of the person making the claim. It doesn't matter how much they try to spread it, because only idiots will ever believe them in that scenario.

The fact that the alt-right is has seen a surge in membership should tell you that this isn't true, that it doesn't work. Reality doesn't agree with you.

You are talking about using "facts" in conversation with a political group that literally invented the phrase "alternative facts" to explain why they lie.

I admire the faith you have in humanity. It is severely misplaced and naive. You are wrong.