One of the peculiar phenomena of our time is the renegade Liberal. Over and above the familiar Marxist claim that “bourgeois liberty” is an illusion, there is now a widespread tendency to argue that one can only defend democracy by totalitarian methods. If one loves democracy, the argument runs, one must crush its enemies by no matter what means. And who are its enemies? It always appears that they are not only those who attack it openly and consciously, but those who “objectively” endanger it by spreading mistaken doctrines. In other words, defending democracy involves destroying all independence of thought. This argument was used, for instance, to justify the Russian purges. The most ardent Russophile hardly believed that all of the victims were guilty of all the things they were accused of: but by holding heretical opinions they “objectively” harmed the régime, and therefore it was quite right not only to massacre them but to discredit them by false accusations. The same argument was used to justify the quite conscious lying that went on in the leftwing press about the Trotskyists and other Republican minorities in the Spanish civil war. And it was used again as a reason for yelping against habeas corpus when Mosley was released in 1943.
These people don’t see that if you encourage totalitarian methods, the time may come when they will be used against you instead of for you.
George Orwell - Preface of Animal Farm