These people are usually reality deniers, so showing them anything is a no go.

And you know how they do it too.

First they do a whole FUD campaign, which get the people riled up and polarized. Up till the point that it doesn't matter what the truth is, it's tribalism, us against them etc. This phase is in full swing in Europe right now. Next they say well what if we do a non binding referendum? It shows the people we are actively taking an interest and we get to see what people think. If everyone votes remain, the issue is done and buried. Then leading up to the referendum they do a massive misinformation campaign, with TV ads, social media ads and posts, etc. Everything they can do to misinform the public, with Russia footing the bill for most of it. Most people aren't interested enough to dive into such a complex topic (and I don't blame them, it's very complicated), so they'll go off their gut and their gut is influenced by their experience in the world and on social media, so they will vote exit. After the referendum is done and the outcome is 50/50, they'll go yell: "THE PEOPLE HAVE SPOKEN". And before you know it your whole country goes to shit and you are leaving the EU and basically committing economic suicide. By the time people realize what happened, it's much too late and all the shitbags responsible have gone away.

If you told me this before Brexit, I would have laughed and told you it's total BS. But then it happened in real life and I don't know how to deal with that.