One of the great weaknesses of political debate is this idea that there’s something called left and right and our feelings must relate to them, like one was black and one was white. Red, blue, black, white or yellow are just the colours of filthy rags, rallying flags under which the desperate and the gullible assemble when the wealthy and ambitious say it’s time to fight. Doesn’t do any harm to keep the hatred going in between times. Banner-...