[orpheus2]

To be fair, Kayaba's World Seed can used for both good and bad.

Spoiler for The Good (Mother Rosario):

It can be used to help terminally ill patients to experience life (albeit a virtual one) they never would have given their current conditions. Thus, it allows them to be somewhat at peace with themselves when they die.

Spoiler for The Bad (Alicization):

It can be used to help create military A.I. or to train future soldiers. This could have damaging consequences especially the military A. I.