Which non US government are you talking about. China is investing heavily and making at least some progress. EU couldn't get "legacy rocketry programs" working, so the reason is incompetence not stubbornness. India is trying a bit, but they don't have capacity to spend. Russia is also trying.

I would call Blue Origin setting off the largest launchpad detonation in history a lot of things, but I would not call it unserious.