I would argue that you are very wrong about legitiment concerns, ie brexit. Before the referendum 2016 in the uk no one (very few) were concerned about europe, and only when the biased media and the leave campaign lied about so many things did any significant number think it an issue. They were shown posters of immigrants messages on buses and told we would get a deal as good as we have now. Add in a few racists and some that thought jonny foriegner was a problem and hey youve got 52%. Agree with everything else.