Said the grumpy grandpa, shaking his hand at the cloudy sky. I dont know what value that comment contributed, funding research is always a long shot. And often times it fails, but that is kinda its purpose, we dont know what we dont know.
your comment made me smile like a grandpa :)
Also lighten up! oh... damn black hole...
There’s an abandoned one around Dallas, the SSC. Lots of sunken cost in that one.
You could use the same argument to justify spending $1B on searching for the Loch Ness Monster. The problem is, you can only spend money once. If you're spending $1B on the FCC you aren't spending that same $1B on all kinds of other research.
With the LHC there was a very clear goal: verify the Standard Model and prove (or disprove) the existence of the Higgs boson - and hopefully discover some unexpected stuff along the way. On the other hand, the FCC is mainly a shot in the dark: they aren't validating a widely-accepted theory, they are just hoping that if you spend enough money on a bigger collider something interesting will fall out.
Most research gives you at least some insight. With the FCC there is a very real possibility that the insight will be "our $20B collider found absolutely nothing, now give us $1T to build an even bigger one". Sure, funding research is a long shot, but at a certain point you're just setting money on fire.