Unfortunately, wars are too profitable, so countries will still allocate a lot of money to it. As we've seen with Ukraine, countries don't even have to participate in the conflict to profit. The US has supplied a lot of weapons, and tech to Ukraine during this ordeal, and it is technically free publicity on their effectivity. The US has more reasons and examples to show for their need of military defense funds. Regular citizens are just along for the ride.
And, it has meant that the rest of the world is "arming", with most of those contracts going to the US as well. It is almost like thy had planned it...