All censorships exist to prevent anyone from challenging current conceptions and existing institutions. All progress is initiated by challenging current conceptions, and executed by supplanting existing institutions. Consequently, the first condition of progress is the removal of censorship.
In an article on Bunyan lately published in the "Contemporary Review" - the only article on the subject worth reading on the subject I ever saw (yes, thank you, I am familiar with Macaulay's patronizing prattle about "The Pilgrim's Progress") etc.
To conquer by sheer force is becoming harder and harder every day. Defensive is getting continuously the advantage of offensive, as we progress in the satanic science of destruction.