At least as it relates to speech in Western liberal democracies, this is alleging there is a slippery slope (and we're not already on it) and there are no mecha

At least as it relates to speech in Western liberal democracies, this is alleging there is a slippery slope (and we're not already on it) and there are no mechanisms that exist or could be introduced to increase the friction on that slope. It's a feel-good platitude of a quote that's basically an appeal to emotion without evidence. Slippery slope arguments, while sometimes valid, usually require more leg work to persuade than a vague sentiment.