Thompson_NCL, nativism collapses because the population without immigration is changing in such a way that no automation on the horizon will ameliorate its demographic challenges in terms of age, health, etc. Indeed, even if we were to press every able-bodied, disabled, sick or untrained body that's currently out of work into training or just about any job, we still wouldn't fully meet our pension contribution requirements, let alone wider industrial, technological and indeed cultural needs (and then you disregard the cost of repeated failure, people quitting jobs and unable to upskill to fit in the economy). Meeting the future by ossifying in authoritarian protectionism is a funny way to ensure one's people prosper.
Further, discriminating against developing countries and merely throwing aid money at the problem, hoping they go away, has the flip side of Britain's fortunes declining and the developing world rising; would you like to be shut out of opportunity and the freedom to take your labour, mind and money where it'll make the most difference then? I don't think so. Would you like to marry and love whom you chose, not whom your state tells you can afford to love? You probably do. Would you like to start a business where it can get the talent and funds to survive and go global or peter out and die in obscurity? Again, you probably would. Do you want a better future for your children, wherever it lies or whatever it takes to get there? I think you do. So there's very little that separates you and that plucky migrant on the big issues of one's life.
For now, Theresa May seems to be willing to indulge your stance a little (not that she wasn't tough in the Home Office before, to the point she had to U-turn), albeit rather cautiously, whether it'll make a difference and isn't turned around by its economic impact is an open question. As PM one's calculus changes.
How a staunch Labour party supporter (and maybe campaigner, or is that someone else here?) can post the above whilst the Labour party are unrepentantly so blatantly anti Semitic I don't know
Antisemitism enjoys a broad range of conspiracy folklore on the extremes, yes. It's neither strictly a left or right thing. This is the reason both May and Corbyn are looking at various aspects of discrimination and racial inequality in society. I welcome all such efforts to address the situation be it in the case of white working class boys failing to benefit from the education system, BAME representation in the professions or racism in political parties. Further, there's no contradiction in advocating one's position and seeking to improve one's political party at the same time.
Personally I find this striving for a utopia of none racist thoughts and actions risible, it's against basic human tribal nature. Some people will prefer some races over others, just as they prefer a car manufacturer over another, or a region over another, and it's normally based on perceived and experienced interaction with a race, religion, region or product. Bad experiences can be ameliorated, perhaps, but the initial judgemental approach is probably entrenched in the human psyche.
You seem to have implicit bias and social conditioning mixed up. However, let's consider which ideal creates a more stable society in the world that is connected, rapidly changing and poses problems no single 'tribe' can fix on its own: nature red in tooth and claw, backed by myth, stereotype and pseudo-science; or equality before the law, backed by universal rights, evidence and social progress?
To me the choice is an easy one to make. Taking the slippery slope option would eventually turn on society itself, however isolated you make it -- the grievances of the financial crash and marketisation and globalisation that preceded it won't go away by simply shunting out the newcomers or shuffling the deck of countries we welcome people from. I'd also venture to add that the majority of the current flux stems from decades of dead investment in the regions, poor infrastructure and the politics that likes taking the benefits of globalisation for granted without spreading the proceeds further than its immediate voter base and material party support.