One more related point—fifth—independent thought and differences of opinion are actually good. I've sometimes thought there are two perfect political jobs in this world: that of a backbench MP in the United Kingdom. There are hundreds of them, mostly with absolutely no chance of ever being a Minister let alone the PM. And do you know what they do? They speak their minds freely and cast their vote freely. They aren't nice and beige and timid. The other is the United States senate where, again, somehow, the whip is more relaxed. So they don't just believe in free speech, they even practise and vote on it. 