Those who excuse or celebrate Mr. Thompson’s killing reveal an ends-justify-the-means sentiment that is flatly inconsistent with stable democracy. An all-things-are-warranted mindset also animated the mob at the Capitol on
Jan. 6, 2021, and campus protesters who have hailed the “martyrs” of
Hamas — groups very different in their degrees of moral transgression and practical impact, but similar in their embrace of extreme measures to right perceived wrongs. To repeat: Most Americans probably reject this kind of thinking. But social media makes what would have previously been ignorable fringe expressions more prominent.