Because there are too many imbeciles in charge in western countries that fall into any of these categories, or multiple.
- Oppose significant military spending. Because it's a waste of money.
- Oppose significant increases of military industrial capacity. Because evil Military Industrial Complex.
- Think that a few wonder weapons can win wars and we don't need a vast arsenal for something like Russia or China.
Etc. etc. etc. The mentality from 90s was proven so very very wrong. It's going to take years to even start recovering from it.