Well, some 90 years ago a certain someone used the "free speech" granted to gain power. The pic you had posted was one of the outcomes of "free speech".
Because "free speech" is most vulnerable to misuse like folks of the Bluessol-kind are demonstrating. People like him are using "free speech" to disseminate the exact opposite of it once they would gain enough power to suppress it. Like a certain someone did in 1933.
There is nothing wrong in limiting "free speech", setting sharp redlines and severe fines if these limits were deliberately crossed. History had showed again and again that only the enemies of democracy and freedom were vehemently defending unrestricted "free speech" as a vehicle to promote fascism and communism.