Hi Satco,
The trouble is that as much as your case seems solid and well made, it won't go very far. These arguments just go round in circles as the "Whole World's a Global Village" Brigade will alwasy throw counters, often disingenuous ones, to sweep any real concerns about long term harmony and prospects aside. Certainly the Labour Party, what ever they say about appreciating the need for immigration control, are sympathetic with nothing of the sort, but they will twist, for example, Brexit, and insincerely present it as a reason for why the immigration problem has been exacerbated. The left ultimately see national borders and identities as intrinsically evil!
FB