This is an extremely relative term since everyone in the world has a different view of what they believe is wrong or undesirable. And not to mention the exceptions to the rule of what may be wrong or undesirable. I didn't see anything that would explain the impetus to censor. I think that the fear of the unknown, fear of change, and the desire to protect at all costs is what drives the censorship issue.
People are unsure of the new technology.
How many people still do things by hand that the computer could do 10 times faster. They're more comfortable with what the know. All though the ages we've seen the fear of change. And people don't want to have their children and other young people exposed to things they consider wrong. In all that I read the biggest advocate of censorship was the government.