One thing about tragedies: They reveal people for who they really are. In the past two weeks, we’ve learned a lot about our media and political class. Our country endured two separate and horrifying mass shootings, one in El Paso, Texas, and the other in Dayton, Ohio. Between them, at least 31 people were murdered. Two massacres, back to back. It’s tempting to look for themes that connect them, but if there are any, they’re not political. One gunman appeared to be a Trump voter. The other supported Sen. Elizabeth Warren. There’s no obvious ideological lesson here. But that hasn’t...