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After all Canada, Australia and New Zealand are such hot-beds of crime and mayhem; we should avoid following their example as much as possible.

Their experiments in cultural erosion are merely a few decades old, and accelerating only recently.

You're basically pointing at a smoker who started a year ago and concluding because they don't have cancer yet cigarettes don't cause cancer.

Those three have been letting in large numbers of people from outside the UK for at least 125 years, not a few decades.