Dating fatwa definition
It stands behind organisations like the Muslim Brotherhood (linked here with the Muslim Association of Britain), Jamaat-e-Islami (strong among some members of the Muslim Council of Britain) and Hizb Ut-Tahrir.
It rests not only on an interpretation of the words of God allegedly spoken through the mouth of his Prophet, but on a tale of grievance.
If Mr Trump starts shouting, or Tommy Robinson, formerly of the English Defence League, pops up, the authorities all know how to try to squash their “unacceptable” thoughts.
In the index of Simon Heffer’s definitive biography of Powell, the words “Islam” and “Muslim” do not appear.
This made waves in the United States too, but my guess is that the question of Islam did not reach the front of the American mind until 11 September 2001.
Fewer than 15 years later, it is the hottest subject. He wants a “complete and total shutdown of Muslims entering the United States until our country’s elected representatives can work out what is going on”.
People are, therefore, right to worry more about mass immigration from, say, Syria, than from, say, Poland.
But, even with high numbers, the problem would be much less severe if our leaders and institutions had greater cultural confidence.