A world with no wars or dictators doesn't exist. To acquire that, you must either: force the people to no longer commit crimes with serious punishment, or trick them into peace that is not only false peace built on top of false reasons, but peace that will last for a few years at best. Forcing peace on the world is the same as dictatorship, making the traveler worse than the darkness. Also, the darkness isn't all evil. Light cannot exist without darkness and darkness without light. They are 2 sides of the same coin. Darkness only looks like the bad guy since guardians were made from the traveler. Since we guardians now have the freedom to decide our own path, we can choose either side, and at last decide for ourselves.