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I suspect that many, if not indeed most, of those new citizens won't much care one way or the other. What does a family from Pakistan or St. Kitts know about Stonehenge in the first place, save perhaps that it's impressive-looking? Yes, it's wrong that they're "taught" this stuff. but it's also probably not relevant to their more pressing financial and employment concerns.
As for the mullahs and their disciples at jihad-enamored mosques (whom we hear much about in America), I'm sure they'd only view Stonehenge as a decadent waste of time if they've ever even heard of it. And do you good people even want to give any of them ideas re a target for vandalism or even bombing?
Something is not right. This message is just to keep things from messing up down the road