There is no clear turning point, indeed I haven't fully given up on intervention as theory. But after Kosovo (which was a process of growing ever more sour on it not a moment of realisation), it was Afghanistan (back in late 2001, NOT when "needed troops were removed to Iraq" as some accuse Bush); and before it, I already wasn't too pleased with how the Bosnian campaign and then occupation was conducted. (And it was the post-Yugoslav wars that made me an interventionist the first time.)

_{*Lunatic*, n.
One whose delusions are out of fashion.}