Well, maybe actually having one of these "country" things costs money, and expecting its citizens to pay for this isn't a completely crazy idea. You can't start raising an army after the invaders have arrived. Well, you can, but it's not going to be too successful.
And then maybe poor people dying in the streets because they can't afford private healthcare turns out to be something that people with any kind of empathy at all would say was a bad thing.
And a few steps later, you're not too far off the status quo in most of the first world.
If you're willing to argue that the "poor people dying or being extremely sick because they can't afford to go to the doctor" is a good thing if it means you get to hoard your wealth, then... as I said earlier, *sigh*.