Thanks to Mamdani and Piker, the 9/11 anniversary remains especially relevant Rather than a distant historical event, the rise of Islamists and woke leftists who hate America and the West is a reminder of what’s at stake in the clash of civilizations.

New Yorkers are debating whether or not it is appropriate for Mayor Zohran Mamdani to attend the ceremonies commemorating the 25th anniversary of the terrorist attacks on America on Sept. 11, 2001. But, like the one about his boycott of the city’s annual “Israel Day” parade, most of the arguments miss the point. The presence of a politician who has cheered on other Islamist terrorists in his career may be unwelcome to many of the families of the victims, and to other New Yorkers and Americans. But just as there was no way to force him to honor Israel by...