It seems impossible to discuss political topics with you without getting on a personal level...
We should call you Neville Chamberlain!
Well, he intervened as the first one, as far as I remember?
The USA did good things in the world as you mentioned Ruwanda (though I don't know the context at all). But they did very bad things, too... if you want to look at them or not.
To refresh your memory. Nevile Chaimberlain is the British politician who met with Hitler shortly before Hitler attacked his neighbours. Chaimberlain went back to England and told the people that Hitler was a man that could be reasoned with!!!
Churchill recognized Hitler as a threat back in 1930 while Europe was still in their "peacenik" mode.
And yes I always have to bring things down to a personal level. We change the world as individuals, not collectively.