Why?

"The spread of Islam presents a profound challenge to open societies. While we cherish tolerance as a foundational value, tolerance of intolerance eventually becomes self-destructive.2 As we struggle to defend secular, liberal values without lapsing into bigotry or xenophobia, the distinction between criticizing ideas and dehumanizing people is essential. But so is honesty: And the truth is that open societies cannot tolerate the spread of Islamic fanaticism indefinitely." seems perfectly reasonable to me.