Jim's answer is basically, due to our bad history we deserve all the negative effects which unregulated immigration will inflict on our society.
That's an interesting answer, but surely rules out any positive results?

STU. "The right rely on hatred and fear to cajole the more gullible in society into believing they are at risk from some sort of menace, but it's a ploy that preys on the unquestioning. Our multicultural society is a strength rather than a weakness, and we have been multicultural for a long, long time."
Ah..another member of the "faith", what you have said Stu, is the unquestioning dogma of "liberalism", dont assume that people on the "political left" dont oppose unregulated immigration.
All political parties now do so, allbeit that they have been dragged screaming and kicking to that position.....people of good sense from all political persuasions have opposed it for years.

Most economic immigrants have no interest in social integration, their homes and hearts are elsewhere, they want to make some money and get back home as soon as possible. Others through cultural or religious reasons have no wish to integrate with a nation of debauched, perverted, infidels.