Do you really want me to list the dozens of instances throughout history where the right to restrict people’s expression has inadvertently caused or helped authoritarians consolidate power? I would think you largely know about those already.
A quite recent example is ironically related to the same topic, namely conservatives and religious zealots wanting to police speech the other way by banning inclusionary language. The other side of the exact same coin. I’m sure you are familiar with that issue since it most prominently happens in america, though plenty of European right wingers are looking to do similar things.