Is that why Goku died? Goku has died multiple times in the story line. Defeated by Cell for a reminder. Goku is very human and while he is able to push past many barriers he is still vulnerable. He was defeated by The God onDestruction and was spared because he was able to challenge him but very easily could have been killed. Goku has lost countless battles but come back to win because he trains hard. He is unlike superman in every way. Where superman did not have to train; Goku does. He is the embodiment of hard work to conquer the unconquerable task. Watch DBZ sometime and see just how "human" Goku is