That’s a prominent and disgraceful Chinese quality:
Utter indifference to the excruciating and totally needless suffering of another living thing.
It’s totally off the hook.
Stories like this permit me to care about Nanking much less.
No God, no fixed set of morals.
It is unjust, like insinuating that all Americans are buggers and baby-crushers.
In every society, there are perpetrators, and there are victims (not to be confused with eac other), and a whole lot of people in the middle who are involved only partially in this evil, or only a little, or not at all.