The unlimited printing of the fiat monetary system is what makes 'forever-wars' possible and profitable.

Since the people are mostly in the dark about how war spending works, or where the money for war comes from, there is little to no accountability on the part of government. Wars can drag on for years in remote places, with no real oversight.

Starting with Vietnam, wars have become 'credit card wars' (h/t @AlexGladstein), since the government borrows money to fund the wars, and then borrows more money to pay the interest on the initial loans... rinse and repeat.

On a bitcoin standard, it would require the people of a country to be willing to help pay for a war. They would likely only do so if it was absolutely and clearly necessary, to defend their families and country, with an end-goal in site.

Since there would be no undue profits to be made, government officials and corporations would not be incentivized to promote or engage in war as a viable option.

Efforts would greatly increase to find ways to come to peaceful, low-cost resolutions instead.