How should a navy make the political case for a carrier?

How could the carrier's evolution be pitched so that governments would approve and fund it?

Present it as organic air power for alliance support, deployments without secure bases, disaster relief, visible deterrence, and conflict prevention.

The political case begins with the carrier's ability to support allies and provide organic air power in the High North or wherever land bases are unavailable. Disaster relief and forward deployment give the ship visible utility outside a major war. Its presence can signal interest, strengthen deterrence, and manage a crisis before conflict begins. Preventing a war is cheaper than fighting one, making deterrence a fiscal as well as strategic argument. These outcomes translate technical capability into terms that an elected government can defend publicly.