If you quote, quote correctly. I wrote "USAians", not "USAsians". What you wrongly quoted might imply something else then intended. Besides, it was the decision of the gov. back then to give shelter to these very questionable "scientists". If you consider mentioning that historic fact as a "slur" against americans, that tells a lot more about you then you might imagine.
Slurs are made by the context of their use. In this case, "USAians" is virtually always used in the context of somebody talking shit about Americans, such as you claiming that Americans have no morality. That's a very broad brush you're painting with, characterizing hundreds of millions of people like that, which is a hallmark of bigotry. This makes it a slur.
