Why did the Romans choose to destroy the rich trading cities of Corinth and Carthage to the ground?

Rome – Corinth – Carthage – large trading cities of the Mediterranean. Rome is a cunning and warlike state. Carthage and Corinth are trade competitors for him. By war, Rome was able to defeat the armies of its opponents, and then, after the victory, the Romans decided to destroy these cities to the ground in order to get rid of competition. Thus, merchants from other countries had no choice. Now Rome became the center of trade. Thousands of merchants from the most distant corners of the world began to flock there.