You can't have Muricans reading about the UN criticizing the USA prisons, and the US "justice system" not being #1 in the world - it would just confuse the citizens, and make them hesitate before the next illegal invasion of a smaller, weaker country.
What's next, the US Mainstream Media on TV informing poor white laborers that China releases an annual report on Human Rights abuses in the USA? Hey, the USA is supposed to be the one criticizing China for human rights abuses!
Yahoo News June 26, 2015
China slams US human rights record in annual report
China on Friday slammed the US for a "terrible human rights record", denouncing it for police brutality and global surveillance a day after Washington criticised Beijing's own performance.
In a report sourced mainly from US media, China said the US was "haunted by spreading guns, frequent occurrence of violent crimes, the excessive use of force by police".
It said that US intelligence had used "indiscriminate" torture against terrorist suspects, while "violating human rights in other countries" with drone strikes and mass surveillance programmes.
The document is released each year by China the day after the US State Department issues its annual global human rights report. Beijing does not release rights reports on other countries.
Unlike China, the US is a multiparty democracy but the report declared: "Money is a deciding factor in the US politics, and the US citizens' political rights were not properly protected."
China said the US justice system suffered from "serious racial bias", highlighting police killings of several unarmed black men, which sparked protests over the past year.
The US has "grim problems of racial discrimination, and institutional discrimination against ethnic minorities continued", it added.