[exmadscientist]

It always surprises me that people do not understand that science funding is infrastructure funding. "Science" (really research) is an abstract thing and doesn't consume money. Money goes to excavation, construction, materials, machining, salaries for scientists living in the area, that sort of thing. Yes, a country will not capture all of that (any supplies purchased from overseas, for example), but those dynamics are well understood and can be mitigated.

Any government willing to fund a large infrastructure stimulus project should be willing to fund a large scientific research project. It is not just throwing money into a black hole.

(Of course, whether any kind of stimulus spending is desirable is a different question.)

[T-A]

Any government willing to fund a large infrastructure stimulus project should prioritize one which maximizes its utility for the tax-paying public.

Some of the infrastructure needed to support a large particle collider (roads, power generation and distribution) may be of general utility, but with current technology, most of the money will literally go into digging a "black hole" and filling it with superconducting magnets and detectors. None of that is good for anything other than particle physics (and at this point, even that is questionable; the most plausible result of a Higgs factory would be just another confirmation that yes, the standard model works, with a few new decimals tacked on to various constants).