Except that Cato the Elder finally got his wishes. Carthage has been destroyed to a point that there's nothing left of it. There's a time patrol story by Poul Anderson named "Delenda!" where someone dickered with the timeline, Carthage was the victorious city and Rome had been destroyed in its place instead. The world was of course completely different. As there isn't a country in the world that hasn't been impacted by the predominance of Rome for several centuries. One detail: the Christian religion in that timeline didn't exist. At some point, the hero asked himself if he had a moral right to change the timeline back and wipe out all the people to serve his own interest. It was an interesting point.