> Let’s lay out the facts: China is conducting human rights violations on the largest scale the world has seen since Nazi Germany.
Even if you ignore events like the Cambodian genocide by the Khmer rouge or the Rwandan genocide, on the basis that, while far more intensive, they affected a considerably smaller population, China's own cultural revolution was a far greater human rights violation than what is happening now in China. (Arguably, in terms of scope, it was even worse than anything than the Nazis did, even if its intentions were probably more benign.)
I'd recommend changing the quoted sentence to something to the effect of "one of the largest scales".