Wrangling with the Freedom of speech has been is and will be endless as long as it lives. It sounds obvious but will we be discussing what it is if we hadn't the controversies born under it and learning from these sometime unwanted controversies it gave birth to to grow our knowledge?
Considering Freedom of speech a vector to acquire knowledge,  once agreed freedom of speech can't be a cover up for saying anything disgusting crossing one's mind, would a predefined freedom of speech clearing in advance controversies, a brake on learning?
Explain.