Yes, every censor claims to be doing it for the common good. The Catholic Church had its Index of Prohibited Books supposedly to protect innocent souls from her

Yes, every censor claims to be doing it for the common good. The Catholic Church had its Index of Prohibited Books supposedly to protect innocent souls from heresy, and likewise in various Communist countries past and present the censorship is there supposedly to stop the spread of counterrevolutionary propaganda. The modern Western world, in theory based on Enlightenment ideals, traditionally rejected such arguments, because they believed the answer to bad information was good information. While I am not a fan of "populist" movements that reject evidence, I frankly fear the efforts to suppress them more.