Well first thing I would ask is: What is anti-social speech? And more importantly, who defines it? If a govt wants to silence opposition to its policies, is anyone who speaks out "anti-social"? Or are you talking about child-porn? Because if you're talking about child-porn or cyber-bullying or whatever, then you're talking about crimes among individuals. But if you're talking about free speech issues like petitions or twittering about rallies, then you're not talking about "anti-social" speech, you're talking about political speech. And I think it has been proven over and over again that the dangers of allowing governments to suppress speech of any kind far outweighs the advantages to the society it is trying to "protect".
In China, the govt has put in place an enormously powerful system of censorship to ostensibly control "anti-social" speech, but is in fact primarily a tool for controlling political speech. People can't see child porn very easily, but they also can't even see a picture of "tank man" (the guy who stood in front of a column of tanks in Tienanmen Sq). What is "anti-social" about political protest? Isn't that how the PRC was founded? They fought a war with the existing govt and won. Now they don't want the same thing to happen to them. China wants to enforce it's totalitarian system to protect those in power who know that if people are allowed to read and discuss anything they want, they would be thrown out on their asses. If you don't want to be censored, well...you're out of luck.
Ever heard the saying "people get the government they deserve". Your statements above are premised on the assumption that government is separate from society rather then being a
part of it. As the authoritarian part of a society, government is the authority on what is anti-social (i.e. against society).
What particular moral view do you claim the US is imposing upon you by asking you to pay for something that it's citizens are trying to sell?
The moral view that they have the right to deny the idea to you, through the use of force, unless you pay them for the use of the idea.