Vimes

'Quis custodiet ipsos custodies? Your grace.’
‘I know that one,’ said Vimes. Who watches the watchmen? Me, Mr Pessimal.’
‘Ah, but who watches you, your grace?’ said the inspector, with a brief smile.
‘I do that too. All the time,’ said Vimes.
-Thud!

... he wanted there to be conspirators. It was much better to imagine men in some smoky room somewhere, made mad and cynical by privilege and power, plotting over the brandy. You had to cling to this sort of image, because if you didn’t then you might have to face the fact that bad things happened because ordinary people, the kind who brushed the dog and told their children bedtime stories, were capable then of going out and doing horrible things to other ordinary people. It was much easier to blame it on Them. It was bleakly depressing to think that They were Us. If it was Them, then nothing was anyone’s fault. If it was Us, what did that make Me?
-Jingo

Now this he understood. He was never at ease with politics, where good and bad were just, apparently, two ways of looking at the same thing or, at least, were described like that by the people who were on the side Vimes thought of as ‘bad’.
It was all too complicated and, where it was complicated, it meant that someone was trying to fool you. But on the street, in hot pursuit, it was all so clear. Someone was going to be still standing at the end of the chase, and all you had to concentrate on was making sure it was you.
-The Fifth Elephant

(ShadesofCyan has right of first refusal)