In the wave of cancellations sweeping America, Confederate statues have been particularly hard hit. They have been graffitied, assaulted, and torn down, while authorities rush to remove them. For his part, President Donald Trump has been a steadfast defender of the statues and other forms of recognition of the Confederacy. He has come out in favor of preserving the names of military bases named after Confederate generals and pointedly said that we should build on our heritage rather than tear it down. Conservatives tend to think the same way. They reflexively oppose politically correct campaigns to destroy anything giving offense....