Disclaimer - I am not a Brexiteer, I am generally pro-immigration, my parents themselves arrived as refugees in the 1980s, I live in an area where some 70% of the population is an immigrant or has an immigrant background - not an exaggeration.
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People seemingly love to point out how the Irish, Huguenots, Eastern European Jews, people of the Commonwealth moved to Britain, therefore we are an immigrant nation. Despite the scale of these migrations being significantly smaller.
In the year ending June 2021, 573,000 people migrated into the UK.
There were 63,089 asylum applications (relating to 75,181 people) in the UK in the year ending June 2022. Probably half of this was attributed to small boat arrivals across the Channel.
Am I the crazy one for thinking this is completely unsustainable?? People are surprised that housing is unaffordable when there is a huge demand for accommodation in London. Mind you, international migrants aren't exactly moving to rural Dorset... they're moving to areas already overpopulated. There are left-leaning opinion makers concerned about increasing automation, meanwhile they're supportive of the working class but simultaneously want to increase migration of low-skilled people to Britain. Do they comprehend how this is diluting the bargaining power of poorer, low-skilled native Brits?
Not to mention people clearly see a rapid change in the cultural character of their local area. Sure cultures change, but this pace of change is unprecedented because it isn't occurring gradually over the course of several decades. If you consider the "cultural cohesion argument" as nonsensical (which is your right), then I presume you will consider "gentrification changing the unique cultural character of an area" to be complete nonsense too?
Are you surprised that people voted in favour of Brexit, or traditional Labour areas voted for Conservatives, or people are increasingly buying into nonsense like "The Great Replacement" conspiracy? I fear that if social democracy does not enforce borders, Fascists will.
Perhaps I am a bit of a biased perspective considering I live somewhere that is the epicenter of immigration.