The USA could afford what's being provided to Ukraine and socialized benefits. But chooses not to because of some dumb reason or another.

So, in your mind, helping to prevent civilians from dying in a war zone and stopping countries being taken over by foreign powers to be exploited is not a worthy humanitarian effort?

The US is already spending as much federal tax dollars per capita on healthcare as the UK spends on the NHS. Figures that bailing out hospitals when patients invariably default on their debt is expensive: In the US they have tons of people ending up in ER requiring expensive treatment that would've been way cheaper and easier to treat preventively -- but to do prevention you need to be able to afford a doctor's visit. Sure you can stop spending that money but then you either let hospitals go bankrupt, or you have to allow them to reject patients and have them dying on the streets. Even for Americans that's a bit too much.

I don't really have the numbers for education but one big point there is that in the US, education is largely funded by local taxes, that is, schools in low-income areas are severely underfunded, while those in high-income areas are overfunded. If anything it should be the exact opposite, the worst areas need the best schools to lift them up.

But fixing either would cut into corporate profits and/or severely alleviate income equality (and, in the US, thereby, race inequality) so, yeah, don't hold your breath.