Don....I would have absolutely no objection to the universal testing of immigrants but the cost would be prohibitive and the exercise would be of very limited value, given the low numbers of infections in other groups(of immigrants)
In much the same way, I would support the testing and contact tracing of other "at risk" groups like male homosexuals and "junkies"( your very non PC discription of intravenus drug users)

I wonder why your "liberal" ideology does not extend to these un fortunate people......not flavour of the month obviously!