This is a two way street. They may dictate not only what is banned, but also what can not be banned. Clearly, depending on which political party or points of view held by those with the most influence at a given time will dictate what types of speech rules are enforced.

One should look at the various democracies in power across Europe and the various regions of the United States and consider just how much control they wish those governing bodies to have on what is allowed to be said, not said, and how it should be said. Additionally, consider what sorts of governance may potentially be in power in the future as well.

Yeah its not really about protecting democracy it always boils down to protecting monopolies from competition.