Why does the government use censorship?

Is scotch tape renewable or nonrenewable? Do you recycle? Is ivy queen a man or woman? How would you describe the ancient roman civilization in the time of Caesar? What do coal influence on human life? Is is acceptable to tell a lie to protect someone? How are humans contributing to overfishing issue? Why the burning level of a substance increases when air blows? What is the concept conservation of resources and its purpose? Do Native Americans receive the same educational opportunities as any other ethnic group? What groups tend to live in areas polluted by toxic waste and contaminated air except? Does Antigone's character represent pre-feminist ideas in 'Antigone'? Betty Friedan argued in The Feminine Mystique that women lacked? What is environmental contamination by human made waste called? How many people get sexually harassed in the workplace? Have efforts to promote sustainability been successful? What is pulltion? Embankment on river that keeps river in its channel? Why do girls turn bisexual? What is the significance of Louis Riel's accomplishments?

Why does the government use censorship?