Doesn't strength in numbers contradict your idea of kicking out the weak?
When I hear phrases like strength in numbers, I think of elephants. When a herd of elephants watches lions circle their community, the strong ones stand around their young to protect them.
That's analogous to "strong" countries subsidizing ones who can't provide for themselves, because having an allied presence is helpful.
Sure, but if they’re not pulling their weight then they’re a detriment. Have you served next to a foreign NATO soldier? I have. I wasn’t impressed. Step up your spending or gtfo.