When President Trump made his startling comment during bipartisan televised White House gun discussions about taking guns first and due process later, I suspected he was doing the same thing he had done during similar immigration discussions a few weeks earlier. He likes to toss out ideas and let them be debated. He heartens his opponents, and because they are so emotionally driven, they overreach, and he comes across looking reasonable while they look extreme. His proposal for a deal, when it comes, seems reasonable to the public. This is "unpresidential" behavior because in the previously existing culture of politics,...