The problem is that it is not just paid Wu Maos partaking in mindless burying of China criticism. Often times, you'll get hyper nationalist Chinese people who just want to help their homeland and they're not getting paid to astroturf. It's not limited to the Chinese - I have seen the same pattern for posts that are critical of India/Indians in engineering boards. I believe that trust is largely gone on large forums due to astroturfing and bots.