Liberals are suddenly realizing that “cancel culture” can snap back – and it hurts. The liberal idea was to “cancel” people who raise “offensive” or “objectionable” topics, summarily ending unwanted discussions by intimidating people into abandoning free speech rights. It was always anti-American. Now, it turns out the left’s beast, is eating them too. Upending the First Amendment by spurning people with different views is a dead end – legally, politically, and socially. Interestingly, conservatives generally offer to debate while liberals stifle dialogue. Now, they are being stifled. Last week, some noted liberals wrote an “open letter” decrying how unthinking,...