> getting involved in nuclear weapons

Pretty much every western country has nuclear weapons. If you're referencing the fact that the US is the only country to have dropped nuclear weapons on another country, keep in mind that it wasn't until 30 or so years later that we realized how bad nuclear weapons are.

Hell, in the 80s, at my uni, there was an experiment to see if you could use nuclear radiation to clean toilet water.

Don't get me wrong though, I agree with your other points.