Earlier quoted context omitted.
So you want law to protect people that say "all X should be killed", then X is not demonstrably super violent/intolerant in the first place? Let's say someone campaigns that all people that have gay sex should be killed: do you want this "speech" protected? Well: I dont. That's why I think "intolerance of the intolerant" is good. Most law books in developed democracies agree with me. White supremacists, racists, fasc…
Yes, I do, actually. We have a number of tiny fringe groups like this in the US, such as the Westboro Baptist Church, which would surely be illegal in most of Europe. I will defend their full right to speech so I can have my full right to speech. In Europe, free speech laws shut down leftist activists, not just "white supremacists, racists, fascists, extreme wahabists/salafits". I think this is a strawman and an idea…
A political party may be banned in Germany, as in: You cannot vote for them any more. For that to happen, they have to be hostile against fundamental parts of the constitution. That is division of powers, free development of the individual, independence of courts and stuff like that. Only then a ban might be even considered.
And it is still fully legal to be against these things, tweet about them or whatever.
This is to -protect- Jews, Muslims and Christians, because as was so colourfully demonstrated in Germany 33-45 it is very easy to run a platform striving to destroy these values within a democratic framework. (Similar to what the Free Speech Paradox is about)
There is no slippery slope here, and your argument that there is either bad faith or extremely uniformed.