Any democracy I know (including the US) has used censorship in times of crisis throughout its history. There is little indication that the "slippery slope" is more than a fallacy.
We are not talking about war related strategic information here, so I don't understand your position. I still don't know about any examples. There should be at least some if it is dismissed as necessary.
If the slippery slope were real and the control of information successful, you might still think this.