Regarding what happenes in Tibet: Tibet is an autonomous region in China, which means that it enjoyes some kind of self rule, so it means that China would never massacre Tibetians like the other side in WW2 did in Babi Yar. Besides, slavery was abolished in Tibet only when China occupied it. And if slavery had been abolished in Sudan, it had been abolished only a few years ago. In fact, as far as I can figure out, the rebellion in Darfur had been caused by Islamic fanatics, who were/are upset that "their" Christian slaves from Southern Sudan had been freed
