Outraged by what Donald Trump says? You are not alone. No high-polling presidential candidate in the modern era has so intrepidly drawn the ire of so many within the American electorate. And there remains no end in sight. Yet in rendering one voting bloc utterly apoplectic, he has appealed viscerally to another. The balance of middle ground politics is not, shall we say, Mr Trump’s bailiwick. But America is no longer a middle ground country. We are already scared by our division — and it is getting worse. The simple truth is, the more provocative his language, the deeper and...