WHY don't we want that?

NO IT ISN'T. Being anti-capitalist might be a left-wing attitude, but let's translate your phrase into plain English. Capitalist immigration=foreigners come here to steal our jobs. That is a solidly right-wing attitude, but it is a great credit that not all rightwingers display that attitude.

Why are you ignoring the rest of my points, have something to hide?

As you have not answered, I must conclude that you agree that immigrants should assimilate. Why then did your parents and yourself not assimilate? Why do you still consider yourself English? Or if you don't consider yourself Australian, why do you have dual citizenship and why did you wait 30 years before repatriating, instead of at the first available opportunity?