That's not a very good comparison. 60,000 people being executed over 6 years is very different from rounding up 3 million people, alive, in some camps. China also has no free press and a heavily censored internet.

Building huge camps and housing millions of people is simply impossible to do in secret.

There's three different categories here:

1) People that didn't know there were internment/concentration camps at all.

2) People that knew there were camps, but didn't know about the murder/torture/etc. They earnestly believed these camps were for detaining prisoners, like the American camps.

3) People that knew everything.

Given that Americans knew about their own camps--and did nothing--I'm inclined to believe that #2 was by far the largest group, while #3 was relatively small.

Also, keep in mind that censored internet is one thing, no internet and fascist death squads keeping everyone in line is an entirely different level of suppression of free speech.

Ok, sure, that's possible. I misunderstood what you meant by "unaware of the camps". Still, a lot of historians disagree with you. The most blunt quote in the Wikipedia article I linked is "General information concerning the mass murder of Jews was widespread in the German population."