I don't think I'd 'turn on the world'. If I had immortality and all that, I'd go live in a nice forest, gather some followers. Rebuild society in a way that it should've been - highly advanced science, culture and learning, but all building and such a part of the natural environment. I'd then send out representatives, ambassadors, one advisor to all the nations in the world. They'd vouch for world peace and a harmonious existance with nature.
Now if someone were to kill such an ambassador for no reason, and attack my peacefully constructed nation, I'd go apeshit and go all vengefull god-like.
So that's what it would take. The destruction of my own personal perfect civilisation.