Could a large Somali harbor turn an Italian carrier into a serious Indian Ocean raider?
Short answerIt could create difficulties for the Royal Navy, but Italy first has to acquire, build, secure, and defend the base against British action.
NotesThe counterfactual requires more than assigning a carrier to raiding duty. Italy would need control of Somalia, a suitable harbor, secure support infrastructure, and defenses against British attack. The Royal Navy could respond by striking the base in the manner of Taranto rather than merely chasing the carrier at sea. The carrier's operational value would depend on a vulnerable logistical chain ashore.