Aircrafts carriers are sitting ducks waiting to be sunk. A pair of it may be useful to exert attacks against a third world country, but in a full scale war against a powerful enemy they will end as artificial reefs for fishes in a few hours.
Building 10 of those is a huge waste of money that could be better spent to try to help mankind rather than destroying it.
See this article for more explanation: This Is How the Carriers Will Die
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