I'm still not clear why so many fear Brexit.
I can't speak for the "many" but I will mention two things that I fear, which I don't think have been raised so far in this long thread. I have no great economic understanding of this, and its based on anecdotes from people working in local and national (Welsh) government.
I have worked in a few deprived areas of the UK, and there is a common story in these area of them being ignored by successive Westminster governments. With any economic recovery they have now seen almost entirely down to Europe recognising them as being amongst the most deprived areas in Europe and giving them the funding that Westminster wouldn't. I wonder how much of the UKs economic success has been a result of Europe direct "interference" in how we spend our money. Ironically, the areas where Europe seemed to have helped the most, were some of the areas with the highest leave votes.
The second concern I have is the environment.
Britain had never showed any real concern about a sustainable environment, and I'm not talking about cute fluffy animals, I am talking about air fit to breathe, water fit to drink and food fit to eat. Now this is something I do know a little about, and I have seen a massive change in attitude over the years, along with enormous improvements in the quality and availability of thes basic requirements for life. But only because of threats of financial penalties from Europe.
The crucial link between a sustainable environment and a sustainable economy has been recognised by a UK government white paper
https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/228842/8082.pdf, but as David "greenest government ever" Cameron said, "once we get the economy sorted out, then we can think about the environment" ignoring his own white paper that demonstrated that former relied on the latter.
Now nothing is just as straightforward as I have suggested in the above, and things change, but my fear from Brexit that we return to the bad old days when it seemed there was little interest in the developing the economy of the more deprived areas of the UK, and no concern about looking after the environmental resources needed to sustain society and the broader economy.
For example, we seem to be relying on "market forces" (and money from Europe) to improve broad band services in rural areas, when the UK Government has recognised it as crucial for rural development. I live 17 miles from Bristol, just off an A road in a cluster of villages and small towns, and I have a download speed of 1.4Mb/s and an upload of 250kb/s, with an official line of "uneconomic to upgrade" unless we pay for it ourselves.
All the people I know who voted remain, were keen to see reform in Europe, but still feared what a UK government, without European influence, might do to the country.
Cheers,
Graham