Re: Chile @Chris G
You may be right with some or all of the negative results of intervening in Libya, but the intention was to stop the large-scale massacre by hired mercenaries of Libyan citizens, and it seemed to have succeeded. Even if we take a completely results-led view of the morality of that intervention (and ignore the intentions and feelings at the time about the awfulness of the massacre, which I think is a pure hindsight-based approach and not sound), then alongside the disorder which now plagues Libya, you have to place the lives of the people who seem likely to have been killed had the US not intervened. So, morally speaking, there are goods and harms there to weigh, and intentions and results.
Afghanistan you're right about, but I don't see how that particular unforeseen result of an action taken to stop Soviet global expansion, bears on the morality of training people to defeat the Soviets. And I said post-Clinton anyway.
As for Maidan, I'm sorry but I completely disagree about it installing the West's man. There was a popular uprising against Moscow's puppet Yuschenko, who fled, and the Ukrainian parliament (who appoints the government) appointed a new one, and the people elected a president who was more acceptable to them, one who had not Russia's nor the West's interests at heart but Ukraine's. I see nothing constitutionally controversial about that.
WMDs were indeed problematic and I did indeed say Bush II argued poorly and provocatively for a war which we may today not even properly understand.
The US today, since Clinton and with the exception I mentioned of some of Bush II's public claims, is not at all "no better than any other country that interferes with the politics abd sovereignty of another." That's nonsense. Moscow invaded half of Europe and Asia and kept it militarily subjugated for 70 years, and now it's doing it again with Ukraine. It's in that context that you have to view the US actions in trying to forestall socialism and Soviet dependency in Lat Am - although I agree it was unacceptable - but it was a long time ago, and America, unlike Russia, is not in the business of militarily expanding its territory.