>>40600529The movie doesnt go as far and as meta as the comic. Like leaving Earth because he was sad he gave some bitch cancer.
In the comic he leaves because he knows it is the time to leave. It plays a lot more into "I am not omnipotent, I can simply see everything that was/is/will be happening. A puppet that sees the strings.
He can disintegrate people because the comic author drew that he disintegrated people. Not because he had any choice in the matter.