Anyway.... So they block sites that they deem unsuitable. Think of it China's form of NetNanny, CyberPatrol, Cybersitter, SurfControl or Safesurf.
The difference is, once you've passed 18 in your own home countries, you can access porn, violence, bomb making recipes, terrorist enabling and training information etc, whilst in China, they don't allow anyone to view any of the stuff which has 'free' in the title, webpage, or whatever. I'm sure there's plenty of other crap available to read and watch though. I don't know why you folks are so het up about something that doesn't affect you.
As for freedoms, yeah, any big country is gonna have a section of society which is anti-social, like the killers, the gun toting youths, the drug taking teens, the gangs, the school shootings. Whilst you won't hear much about it in China, as its mostly hushed up, people talk, and news gets around. It might not be on the state sponsored tv networks, but things do get around, internet or no.