Well... The US Defense budget for 2021 alone is 7 times the money needed to build a new LHC (705 billion [1] for the US defense in 2021). Germany will spend a similar 100 billion dollars on weapons in the coming years. So while 100 billion looks like an amazing amount of money, the military spends this in the blink of an eye and without the slightest promise of a RoI...

[1]: https://en.wikipedia.org/wiki/Military_budget_of_the_United_...