alt Hacker News> Not all types of fundamental research have the same potential for material benefits, or the same cost.
It is hard to gauge this is in advance though. If you were sure what you were gonna find, it wouldn't be much of a discovery. Historically it has sometimes been decades before manufacturing and practical applications caught up to frontier research. For an extreme example, mankind knew of electricity in some form for 2400 years before doing anything practical with it. If all the people who prodded at it instead thought "man I can't imagine what this could be useful for" and found something else to do with their time, we'd live in a very different world.
Our civilization can afford to aim higher than incremental improvements on pixel density for screens on which to spectate people kicking a ball around. Personally I find frontier discoveries to also have much greater entertainment value than sports events and will happily fund them with a tiny fraction of my tax dollars.
> It is hard to gauge this is in advance though. If you were sure what you were gonna find, it wouldn't be much of a discovery.
Virtually all previous particle discoveries were predicted, and then we built devices to find them, eg. the Higgs was predicted in the 1960s. There is no such motivation here. There is no theoretical or significant practical benefit for the FCC, it's basically a jobs program.
There is better frontier research that could use those funds for much better payoffs. For instance, just sticking with particle physics, Wakefield accelerators would be orders of magnitude smaller and cheaper than the LHC while achieving the same energies. We've also never built a muon collider, and so that's largely unexplored territory.
We just don't need another radio frequency particle collider, we've reached the limits of what they can do within a reasonable research budget.