The issue is that countries see each other as equals and the punishment trick can't be easily used when nuclear weapons are involved.
Should we dehumanize those who dehumanize others? I don't think so. The US for a very long time has grown in a moral authority that is overreaching and over simplistic in it's definition of humanity. The only way to break cycles of hate is to show that there is a better way, not through the domination/punishment lens.
We're all products of rape and murder. To see rape and murder and not remember our past is to bask in cultural wealth wondering why everyone else is so poor.
I believe that on the balance the systems as currently in place are relatively moral. Especially compared to historic precedent (also compare Russias war in Syria to the US wars, having to convince a domestic audience that you're the good guy puts real constraint on the use of military power). But the level of immoral behavior even just focusing on past WWII/Post-colonial times is still staggering and easy to point towards for others.
"He may be a bastard, but he's our bastard."
Behind numerous cultures is a long tapestry of human exploitation punctuated by periods of total war.
https://en.wikipedia.org/wiki/History_of_slavery_in_the_Musl...
I don't think that China's recent success disproves this. China spent decades experimenting with ruthless authoritarianism, and wound up decades behind the world. They relaxed their hold for a time, and experienced massive catch-up growth -- growth they would have experienced much earlier if their government had been properly managed.
The real question is whether they'll be able to continue that growth if they turn to a much more authoritarian model, which seems to be the direction they're going. And I'll be frank that there seems to be very little historical evidence that this approach will lead to continued economic (and thus political) dominance. In fact, all signs point the other way. It's just unfortunate that we keep trying the experiment.
Western capitalism may be like a pack of wolves freely cooperating without leashes, but China's is like a pack of wolves wearing shock collars. Most of the time they're on their own, but they have to be mindful of what their master wants or they'll get zapped. That latter system might be good enough to compete with the West.
Then there were those who didn't care about the human rights issue and just wanted to make money, who thought they could use China as a massive cheap factory forever. Never thinking (or caring) that China could one day surpass us and turn the tables. This was greed.