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The process of learning English, and getting from eastern Europe into the U K filters out a lot of the more feral riff-raff. Immigrants tend to be smar ter and more enterprising than the native population - particularly when na tive population - as in England - is the residue of generations that couldn 't be bothered to emigrate to America or any of the other colonies.
The proportion of bad apples in the people you import may be higher than yo u like, but it's almost certainly lower than the proportion in the native b orn population.
Of course, people have been migrating to England, or invading the place, si nce the Beaker People
At the time the native population would have complained that they weren't p ainting themselves with the right shade of woad. Nobody knows where Cursito r Doom's ancestors migrated from, but he's adopted one of the less attracti ve local customs to perfection.