Do you seriously not see the problem with that?
Do you seriously not see the problem with not questioning that? We can’t afford universal education and healthcare, but we can afford aircraft carriers that are obsolete for force projection (inexpensive surface cruise missiles from China) and F35s that can’t fly, kill their pilots, and are generally speaking not fit for purpose? [2].
[1] https://www.theguardian.com/world/2007/feb/08/usa.iraq1
[2] https://www.thedailybeast.com/military-admits-billion-dollar...
Countries can exist without universal education and health care.
They cannot exist without national defense (whether provided on their own or through an ally). Sorry, that is simply a fact.
Also, national defense is a clearly enumerated function of the federal government per the Constitution. Neither of the other two is.