Most of the European nations have a type of "free speech" in their governing documents, but they also allow for restrictions upon those freedoms, especially when it comes to Nazis and Holocaust denying. The very same laws were floated in America and the UK as well, but promptly shot down as a violation of free speech.
Consider it like our Second Amendment, where there are numerous encroachments on those freedoms, passed by the legislature and declared legal by the courts, giving me wonder in what Constitution they now teach at Harvard and the rest. These thought restrictions are also exactly what the extremists on both sides of the aisle wish to have in our own nation, the ability to outlaw specific religions and speech, and often call out the restrictions on the 2A as justification for such. All encroachments are illegal and stand as a smack in the face to those who fought for our independence. Same goes for encroachments on the 4A, both parties have whittled away at that one for the last sixteen years, both of which are done in the name of security screaming about the children. I shudder to think where we will be in fifty or a hundred years.
