Okay. Let me break down my arguments in 2 parts:

[1] China is not similar to Nazi because the extent of "cleansing" is not on the same scale as Nazi (even if you count death sentences on illegal cult members)

[2] China is not similar to Nazi because it does not initiate new wars against other countries (Tibet was incorporated as a result of ongoing conflicts between China and other countries for decades, so it is not really an invasion)

I shouldn't have concluded that countries are not declaring war against China is due to [1]. However, it can be explained by [2]. Regardless, I believe both [1] and [2] stands.