Christopher Caldwell has a new book out called Reflections on the Revolution in Europe: Immigration, Islam and the West. Several excitable correspondents e-mailed to point out what they call a “devastating takedown” of its message by Matt Carr of Britain’s Institute of Race Relations.

So I read it. I especially enjoyed the way Mr. Carr believes his corrections on certain details amount to a stunning refutation of the overall argument. A careless reader could be forgiven for thinking they confirm it:

To prove this thesis, he claims that 57 per cent of Irish Muslims want Ireland to become an Islamic state, citing a survey carried out for the Irish Independent/RTE by the Lansdowne market research company. The actual figure quoted in the survey found that 57 per cent of young Irish Muslims wanted this outcome, compared with only 37 per cent of Irish Muslims overall.

Oh, only 37 percent. So that’s okay, then. At least until that 37 percent start to die off and the 57 percent become more representative of the general Muslim population. But maybe they’ll all be prancing around with a Guinness in one hand and a shillelagh in the other by then. Gotta look on the bright side.

It’s interesting that many of the readers who send me links to analyses arguing that the GOP vote reflects the electoral math of 1972 and hasn’t taken into account the vast demographic changes since then are the same people who insist the far more dramatic demographic changes underway in Europe will have no consequences whatsoever.