Will Earth ever be rid of bad guys? Yes, because in the future there will be no life on Earth at all.
When all else fails, the sun will grow so hot as it ages the oceans and fresh water will dry up. Vegetation and all other lifeforms will cease to exist. Then the sun will grow and become a red giant, completely swallowing Mercury and Venus, and possibly Earth, but if not Earth, Earth would be too close for comfort from the sun’s surface.
At that point I suspect Earth will be completely void of all evil, rogue and repressive regimes and bad guys. In fact, it will be completely void of pretty much everything and look much like what Venus looks like today!