It's about control of speech, and it has always been the Left that has a greater interest to control language because the Left needs to appeal to (or manipulate

It's about control of speech, and it has always been the Left that has a greater interest to control language because the Left needs to appeal to (or manipulate, convince) a lot of people on their side. The Right more often uses money as a means of control. That's why socialist states were such pioneers in propaganda. Not all extreme ideologies produce censorship, but extreme power does.