"Because I don't see Dumbledore in any other way, unless you think he is totally incompetent. Having written him that way for 3 1/2 years, over numerous stories, I still don't see any reason to change, other than the exact balance between manipulative and incompetent"
That's what doesn't make any sense. It seems to be based on the idea that Dumbledore is or should be omniscient. He is either manipulative becuase he knows everything that is going on everywhere and allows it to happen, or he is incompetent because he doesn't know everything. It's a point of view doesn't seem to take into account the actual possibility that he neither knows everything nor is supposed to (or somehow flawed for not) knowing everything. It doesn't make any sense at all.