[alexx]

I think the most interesting thing about the greater good idea was that it's employed in a lot of situations, in Grindelvald's it was to one extreme, and not one with a positive impact either. Dumbledore, however, still acts for the greater good and it turns out alright. He doesn't tell Harry certain things so that he can come to certain realizations himself, so that Harry can understand and act for the greater good -saving all those people by being the one to face and defeat Voldemort. So it kind of depends on the person's understanding and interpretation of the idea of the greater good.