Based on those cables, he was bred by the party elite to rule. He and his family have been the party for 2 generations, the entirety of that horrific stuff has gone on under their moderate watch.
Xi is scarier than others like Erdogan and Putin because he's not an outright villain, but that benign acceptance and normalization of humans rights abuses goes on while we buy phones from them and he and the party get further and further cemented into power.
That's horrifying, with a villain at least people would wake up.