Did the Romans do justice to Carthage, Corinth?

Perhaps these actions of the Romans were not fair, but they were very effective. Rome destroyed its main competitors at sea. It is worth clarifying that the same Carthaginians treated the captured cities and peoples in the same way, and when their troops invaded the Roman lands, they ravaged entire cities. It is not known how they would have acted in the event of a victory over Rome. So by destroying these cities, Rome showed the peoples of the Mediterranean that it was not the best idea to go to war against it, and the Greeks became their allies.