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Why did Rome decide to support Messana against Carthage and Syracuse?

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Historical map of the western Mediterranean region during the Punic Wars, showing Carthaginian territory in orange and Roman territory in green around 270 BCE. Hannibal's route from Spain, across the Alps, and into Italy between 219 and 202 BCE is marked with a red line. Key battle sites with years are labeled throughout Spain, Italy, Sicily, and North Africa. — Punic Wars The Punic wars led to the destruction of Carthage.

Rome’s decision to support the Mamertines in Messana was primarily driven by a strategic desire to prevent Carthage from gaining total control over the Strait of Messina.1

The conflict began when the Mamertines, a group of mercenaries who had seized Messana, found themselves blockaded by Hieron II of Syracuse. The Mamertines initially appealed to both Rome and Carthage for aid. Carthage responded first, establishing a garrison in the town to prevent the strategic location from falling into the hands of Syracuse.21

Rome, however, was unwilling to allow its rival to dominate the straits. After the Mamertines expelled the Carthaginian garrison and requested Roman assistance, Rome intervened. This move brought the two powers into direct confrontation, precipitating the First Punic War. While some Roman senators hesitated, the Roman people largely supported the intervention to deny Carthage control of the region, reflecting a broader geopolitical struggle for influence in the western Mediterranean.21