I think execution is the only tool that China has to keep the large p[opulation follow the law of the land.Executions have taken place for bribery, rape, theft in addition to anti national activities.
They do not want to follow the Indian model where punishment rate for serious crime is extremly low and the wealthy & mighty can swing decisions the way they want.
They do not believe in releasing a terrorist and foreign minister escorting him to Kandhar.
I think they are justified in what they are doing. Imagine how many millions were killed in the name of War against terror.At least they do not have any right to teach morality to the world and talk about human rights.