I don't know if "True Leaders" want power. There are plenty of people who are leaders in spite of themselves - that is actually the premise of Moses...or even Jesus about not wanting to die on the cross. There are probably some parallels there to Islam. And as a result these people become leaders out of neccessity rather than desire. I would suspect that this is true across businesses and civil life. Perhaps MLK became a leader because "some one had to do it". Rosa Parks is another example. Anyway, you have the general idea.

That being said, I think that there are plenty of leaders who want power selfishly. And to by the same token it does not matter what venue they choose. The Church or Religion in highly religious areas, or Military or Civil in other areas. And in that respect, Power itself is the aphrodiasic. The bad part here is that these type of leaders also consider their role as for "the good of all", when it is for the good of a few.