One of the points made recently was that it's not necessarily possible to prevent "foreigners taking your job" in a globalised world. Prevent immigration? The industry goes overseas anyway. Prevent imports? Doesn't result in locally-made artisan iPhones. You can see that in e.g. Brazil where there's a high import tax on electronics. It doesn't result in import substitution but just handicaps people trying to build businesses that use tech.

There is no option for "make the foreigners cease to exist" or "make them stop wanting to compete their way up to our standard of living".

"Distrust" in general in the UK and the US is probably fed mostly by the spectacular rise of media management and post-truth politics. Trust is a valuable public resource: a high-trust society can get a lot more done because people don't have to spend all their time securing themselves and their business deals, but can trust that genuine infractions will be dealt with and normal non-harmful activities left alone. It's always possible for anyone to do well in the short term by breaching trust, but if too many people do this it's like overfishing (another EU issue). Once lying becomes routine we end up stuck in the wrong side of the Prisoner's Dilemma.