If Nietzche was writing today, he may well have written Zarthustra as a Lawyer instead of a Preacher

There was an article in the Economist that based on statistical research claimed that in the developed world: "In democracies [Economist's word for developed countries] lawyers dominate [the political scene.] This is not surprising the law deals with the same issues as politics: what makes a just society; the difference between liberty and security; and so on. Lawyerly skills-mashaling evidence, appealing to juries, command of procedure- transfer well to the political stage." (http://www.economist.com/world/international/displaystory.cfm?story_id=13496638)
And they seem right. The article compares lawyer leaders (US) to engineer leaders (China) and explores very intresting angels...trying to fit best sraight line within very scattered points.
Allow me to introduce another perspective on high concentration of lawyers among the ruling class. Oh shit...It's almost 2 am and I have to wake up at 7. Bad timing I guess. No worries. I'll point out to some similarities and leave the hypothesizing to you. This way we can both save some time.

Christian Morality = Humanist Morality
Rule of law imposed by god = Rule of law imposed by Basic Human Rights
Holy Bible = Bill of Human Rights (International Law)
Preists to interpret the word of God = Lawyers to interpret Human Rights