I thought I'd relate an example from the parallel universe of the office.
On Monday my colleague H. sat down with me in the canteen towards the end of my lunch and started a rant about leaving the EU, essentially because of immigration. I was in no mood for this and just walked off, but later on, I regretted being rude and dismissive like that. I went to see H. to apologise and said I would hear him out. When he was done, I concluded that I had been right to storm off in the first place, but here are his arguments, which I have made a special effort not to jazz up, just paraphrase:
1. All these immigrants/asylum seekers from Syria are coming here just for the benefits, unlike previous ones who came here to work hard.
2. They are much more likely to be rapists and kiddy-fiddlers than other people.
3. He has a view of England as a lovely, picturesque place like on tourist brochures which he would like it to be again, although he accepts it may never have been that way in the first place.
He also accepts that his comments 1. and 2. are sweeping generalisations but stands by them nonetheless.
The next day, I sent him a slightly edited and contextualised version of Bogtrotter's list of things the EU had done or at least attempted to, specifying that not all of them were done well or indeed successfully, but that was the intention. A few hours later, H. came to see me to say that although he couldn't be bothered to read the whole list, it had, together with our discussions, prompted him to review his position, and I quote: "I realised I don't really have a problem with the EU. It's IS I don't like".
Now the easy response, and indeed my preferred one, would have been to sarcastically say that I also often had trouble telling the difference between Belgian bureaucrats and bearded murderous Fascists, but I didn't. What the discussion highlights is that the entire conversation is mired in a morass of poisonous, undifferentiated, unsourced disinformation. To a great extent, it's H.'s fault that he arrived at these conclusions. I'm pretty sure he scans the Daily Mail website for the stories about celebs in bikinis, and just gleans mixed-up headlines in his peripheral vision. I know that he considers "Google" to be a source. But that's the effect of the appalling quality of much of the public discourse.
The irony of all this is that H. and his family are Sikhs and he's throwing in his political lot with people who would quite probably not want them in their chocolate box England...