Why America needs a hate speech law

When I was a journalist, I loved Justice Oliver Wendell Holmes Jr.’s assertion that the Constitution and the First Amendment are not just about protecting “free thought for those who agree with us but freedom for the thought that we hate.”

But as a government official traveling around the world championing the virtues of free speech, I came to see how our First Amendment standard is an outlier. Even the most sophisticated Arab diplomats that I dealt with did not understand why the First Amendment allows someone to burn a...