So you don't think it possible that, with appropriate checks, some of these people might be, as my family was, very motivated to make a success of their new life and bring useful skills to this country?
Bear in mind, as I have posted before, part of the population increase is due to the rise in numbers of the elderly, who are not being replaced by births.
Maybe we'll need younger, fitter, folk to drive our buses, run our health service, stack our shelves and build our roads.
My daughter and her family live abroad, and have brought skills to their adopted home - my daughter is undertaking a research PhD in her new language.