What does it say about us that (I would guess) most well educated westerners know about the "Carthage must be destroyed" quote but not the "Carthage must be saved" one?
It says that we care about the real as opposed to the imaginary. That is entirely to our credit.
Regardless of what may be considered moral, Carthage was destroyed. Educated people who wish to understand ancient history therefore naturally wish to learn of Cato's anti-Carthaginian campaign, precisely because it was successful. In addition, Cato the Elder was considered a model of behaviour by subsequent generations of Romans, in a way that Corculum was not, therefore to understand ancient Rome we have to understand the behaviour they valourised.
Similarly, Fumimaro Konoe is not nearly as famous as Hideki Tojo. This is not because educated Westerners favour Tojo's foreign policy, but because Tojo won the debate and Japan went to war.
Good point.
Another month, another rationality quotes thread. The rules are: