I find that people's investment in the freedom of speech thing goes right up until the point where it reaches a topic that directly affects them personally. Then, all of a sudden, they become incredibly invested in what can and cannot be said.
I also find it is used as a device for certain people to push shitty agendas without opposition. As soon as they become challenged about their views, then up comes the freedom of speech shield. It is really effective, as you can usually instantly find an audience of people who will fight your corner despite the damage you doing.