On the mainland, Mr. Z found that the milk he fed his baby was tainted by harmful substances. So he complained and protested, and tried to fight for justice for himself and his fellow suffers. He was never violent. Yet he was put into prison for a long period because of this. Outrageous! Abuse of justice! - we all say.
In Hong Kong, priest L complained, at a seemingly light-hearted moment at Halloween, that an extremely rich Mr. L was like the devil because he built apartments with inflated floor areas. The words priest L chose was perhaps a bit harsh, but no more than many people were saying privately. However, Mr. L was quite upset. The church was then pressured into saying they were sorry.
The mainland case is, of course, much more serious than the Hong Kong case. But the messages behind the two cases are the same: Don’t criticize us the powerful. If we don’t like what you are saying, we can hurt you. So, don’t!