Democracy is not the best form of government, it is merely the stopping point between a Republic and a Tyrannical Regime.
There has never been any long-lasting pure democracy that did not establish itself as a Republic first, and a Democracy second.
Though, yes, I may have misunderstood the point you were trying to make, but that's because I really don't think we should be a party to the UN, WTO, or any supranational.
As far as the wars, yes, foreign wars are a waste of blood and treasure that will ultimately result in a world that views us with suspicion, hatred and loathing. We can not garner respect with force.
We are not right because we are mighty.
We are mighty because we are/were right. (I'm more inclined to use the were, just because this country is heading downhill towards a socialist tyranny).