@KyuMazu well, there's quite a few famous philosophers who believe that and explain why in detail. Probably the most famous would be Machiavelli, for example. I don't plan on telling you there's a definitive answer though, since it's a very debatable topic.
@jak
I think she answered that. He was behaving as something more than a hero, “taking the place of god”. As a saintess she couldn’t let that go on, he needed to be punished.