Peoples will be as before, the sheep sent to the slaughterhouses or to the meadows as it pleases the shepherds.
I mean, the first 'Back to the Future' is kind of a perfect script, I think, in terms of handling time travel the best. It depends on your definition. To me, that means it effectively uses it in the story.
Governments oppress people, but so do mobs. You need to avoid both to make progress.