Stay out of everything. “Beware of alliances and foreign entanglements...”. Someone important said that once.
Should have took that advice to an extent, would have saved us a lot of pain.
Nobody said that. It’s a bad paraphrase, just like “separation of church and state”. Not all alliances are entangling, which is what the real quote acknowledges.
Washington said in his Fifth Annual Message to Congress that the USA, “if we desire to secure peace ... it must be known that we are at all times ready for war”. And allowing any new “world police” that is bent on imperialistic expansionism to rise on the scene is antithetical to that.