All I can tell you is that of all the liberals I've ever come across, none is likely to fail your test and sit by while the holocaust occured because they respect too much the sovereignty of Germany.Well, I'd like to think that she's right. Indeed, I think if you were to take the 100 million most "liberal" Americans (whoever that would entail) and replaced 1936 America's population with them, it's quite possible that Roosevelt would have been able to declare war against Germany in 1939, instead of waiting two and a half years.
But this isn't the issue, because World War II was never fought over the Holocaust - we simply didn't know the extent of Germany's industrial death machine. Rather, the war was fought against Nazi aggression, and the reason the west waited so long was a very simple one - most of the decision-makers had lived through World War One, and were loath to start a new war. So, Amanda, you should ask yourself another question, and this one is more diffcult: Of all the liberals you know, how many would have started World War II early, after having lived through World War I? I'd like to think that I wouldn't be afraid to stand up to Nazi agression, but if I'd grown up all my life knowing my father (for example) wasn't able to exert himself because of breathing too much mustard gas in the trenches, then maybe I'd be scared of what the new war would bring, too.
The question of liberal interventionism is a bit different, of course. Intervening in Rwanda wasn't likely to start World War III - and we still failed the test. And our intervention in the Balkans was so late as to be a failure. Afghanistan wasn't about liberation, but it's been a failure in that regard too. Iraq, well, with the bodies stacked like pallets, I think we can say the humanitarian angle is a failure as well. But it's worth saying that it wasn't because of liberals - certainly, it wasn't President Al Gore who botched the war in Afghanistan.