To maintain political and social stability.

Well, this is a justification, but not a moral one.

This one can be employed to justify any arbitrary measure applied by any arbitrary authority at any arbitrary point in time.

Morality is relative, to them it maybe very well be the moral thing to do.

>This one can be employed to justify any arbitrary measure applied by any arbitrary authority at any arbitrary point in time

Yes it can but you don't have to agree with it

> Morality is relative, to them it maybe very well be the moral thing to do.

It certainly is not how they would want to be treated, or this whole discussion could simply be settled by the holders of one opinion murdering everyone else. Nobody wants that applied to them, making everybody who rationalizes it being done to others a vulgar hypocrite.

You say that "to them it maybe very well be the moral thing to do", is that actually the case?

Its impossible to really know because I'm not them thus I say maybe, but it certainly possible that they think is the moral thing to do right ?

I don't know since I'm not Chinese.