Totalitarian states do not like freedom of speech or the press. It is harder to control the press on the Internet. Some things can be blocked. Others are tougher to keep suppressed. Therefore Beijing police launch Web patrols to warn readers to quit reading what the nanny state finds politically or morally improper.
Many laugh at and mock book-burning performed by religionists, but totalitarian, leftist governments make it a matter of law. Guess who the hypocrites are.