It was a crazy thought for me, too, but something to also consider is that there's some selection bias in the Chinese that you might talk to (i.e. Chinese peopl

It was a crazy thought for me, too, but something to also consider is that there's some selection bias in the Chinese that you might talk to (i.e. Chinese people that talk to foreigners regularly) vs. ones that don't; the ones that do probably tend to know more, whereas the ones that don't probably fall into the "never heard of Tiananmen" category.