If I'm writing by intuition, generally that calculation works itself out. But if I'm writing a mystery, and somebody has to have a reason for doing what he's doing, and it's not anything I can imagine myself wanting to do, things get a little more difficult to write, and careless mistakes are made.
The typical lawmaker of today is a man wholly devoid of principle - a mere counter in a grotesque and knavish game. If the right pressure could be applied to him, he would be cheerfully in favor of polygamy, astrology or cannibalism.