Only if they're extremely naïve. A common theme I see in pro-censorship people is they assume the ability to censor will never fall into the hands of horrible people, that somehow the government will always remain in the hands of people they find reasonable and agreeable. Ultimately, the government is an apparatus of power with a tendency toward tyranny. It is neither inherently good nor bad. In democracies we try to limit this tendency toward tyranny through checks and balances within the governments' various branches and departments, as well as making politicians answerable to the people through election and referenda, and holding everyone equally accountable before the law (in theory). In this context, the freedom of expression is important for keeping the government answerable to the people. If publicly available information is restricted to only what the government allows to be published then the people are incapable of making informed political decisions, and democratic process ceases to provide any meaningful franchise to the people, completely undermining the entire point of a democracy.