i think you wrong. it wasnt about "noticing" and besides if you notice what you are going to do? you can notice Wall street movement but did you and EVERYONE else joined?
during WW2 most countries were busy fighting or preparing to fight with aggressors.
on the other note, if you dont live in US but in one of country where abortion is illegal and assumed a human killing, you can notice 50,000 abortion done in China every day. Thats 15 million abortions a year, more than holocaust claimed. Do you see everyone "noticing" and doing something about it?
You have valid points with your abortion point in that it's very often about perception of right and wrong. But it looks like the U.S. at least didn't "know" until a year after they entered the war[1], but even when they did, it appears that they had reservations about acting on it[2] (ie, do you bomb Auschwitz and kill the current prisoners to prevent future prisoners from being gassed there?)
