Lumping much smaller items in with any of the very small number of huge items in the budget can be misleading, is all, in a “ants are really heavy! Why, this other piece of material with an ant on it is a bit more than ten kilos!”, where the other thing is in fact a ten-kilo piece of steel, sort of way.

One can do things like say, “foreign aid is out of control! Why, our defense and foreign aid spending is XX% of the budget!” to imply that the foreign aid portion of that is more than a rounding error, which it is not.

I'm sorry, I'm still not following. Yes, Medicare spending is a huge component of total federal spending because Medicare has lots of beneficiaries. But that's true of schools and transportation and, yes, military (which is dominated by opex).