As my colleague Jack Crowe has noted, a bombing suspect is in custody. His name is Cesar Sayoc Jr., and as you can see the instant you log on to Twitter, he apparently drove a white van covered in pro-Trump stickers. That is not a vehicle a normal human being drives, and now I’m seeing the right side of the Internet light up with takes saying that he’s obviously “crazy.” Let’s use caution with that claim. It’s a word that can allow us to wrongly minimize the significance of the attack. There is a huge difference between obsessed, violent, unstable,...