Writers in other tolerant countries have been noticing the blowback from multiculturalism. The Dutch novelist Leon de Winter wrote that as traditional Calvinist discipline frayed and Muslim immigrants rejected Dutch tolerance, "the delicate mechanism of Holland's traditional tolerant society gradually lost its balance."
Multiculturalism is based on the lie that all cultures are morally equal. In practice, that soon degenerates to: All cultures are morally equal, except ours, which is worse. But all cultures are not equal in respecting representative government, guaranteed liberties and the rule of law. And those things arose not simultaneously and in all cultures, but in certain specific times and places -- mostly in Britain and America, but also in various parts of Europe.
In America, as in Britain, multiculturalism has become the fashion in large swathes of our society. So the Founding Fathers are presented only as slaveholders, World War II is limited to the internment of Japanese-Americans and the bombing of Hiroshima. Slavery is identified with America, though it has existed in every society and the antislavery movement arose first among English-speaking evangelical Christians.