1. I disagree with OP's entire premise. He got exactly the response called for under the circumstances. It was polite, presumably factually accurate, apologized for the inconvenience and explained why US would not compensate OP or take responsibility for having done less than what it should have done in the circumstances. Anything more would be fawning and that's not good CS, it's fawning.
2. If the purpose of OP's trip was a specific event which it became evident he would miss, he need only have advised the GA that his had become a trip in vain, asked to be routed back to his origination and refunded his ticket. But, that's on OP for not asking.