…open speculation not based on any spoilers below.
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Here’s my theory. They are glossing over this in this episode, but the process of “resetting” is probably more horrific than it sounds. Each reset doesn’t just result in the wiping of the timelines. If you think about it, billions upon billions of people and aliens and things just die after every single reset.
The show is about Loki discovering his moral centre. And by the end of the show Loki comes to realize that destroying the new timelines is morally repugnant. So what would Loki do if he became the ruler of Midgard? He would conquer all the other realms until he became the “King of Space”. Then he would conquer all the universes to become the “King of the Multiverse”, setting up the Doctor Strange movie (which Loki Head Writer Michael Waldron is also writing).
And what would the King of the Multiverse do once he has conquered the Multiverse?
He would protect it, and protect its people.
And I think that this is what Mr. Mobius is setting up.
Its either this or Mephisto . 