Being "too strong" can lead to cockiness that both gets a nation into wars it doesn't need to be in and makes it lose a war it should have won.
...no one ever lost a war from being too strong. We lost nam cause we were fighting on four fronts. Vietnam, Congress, Academia, and the media. Once those four entities convinced us we couldn't win, we lost.
...not being strong enough can lead to cockiness by the bad guys.
...BTW: if we had kicked the NViets arses and possibly the Chinese my question was "Then what?" Another nation state dependent on us? We didn't need that. I wrote my parents from nam and told em that the S Viets were as corrupt as any on the planet and that we were involved because we had two crooks fighting over a dotted line on a map. On the surface it would appear to be a close approximation of the russia / ukraine conflict. Problem is that Russia will want to move the dotted line every ten years or so.

Liberals are like a "Slinky". Totally useless, but somehow ya can't help but smile when you see one tumble down a flight of stairs!