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If we solve fusion, surely we have a lot of cheap energy (and attendant economic output) to throw at solving physics?

No. It would cost far, far more to extract useful energy from fusion than using well-understood renewables.

And, we control plenty of energy. The project is to concentrate it in one spot.

What is meant by "solving fusion" if not making fusion an economically viable source of power?

And I didn't mean to suggest that available energy was the limitation on building LHC++, but rather that available economic surplus was.

In that case, fusion will never be solved, and any money spent toward that goal is money wasted.