It's the paradox of tolerance (https://en.wikipedia.org/wiki/Paradox_of_tolerance), where by showing tolerance to the intolerant, the intolerant will eventually keep pushing and eventually destroy the tolerant.
But I think there's a way around that, especially on platforms, it's just to separate opinion from personal attack.
HN does that pretty well, though not perfectly. But in society people have gotten away with promoting this pretend idea that ideas can be the same as violence (or variation on that) and want to pretend that some general claim someone makes is the same as a personal attack. If we can have platforms that are mature enough not to get caught in that, I think it's possible for different views to be aired and repugnant ones to be called out.
The prime example is Germany that forbids any mention of Nazism. There are some that say removing all mentions of Nazism will doom us to replay a similar tragedy. Others say that mentioning it will draw followers. It’s not only important to draw the line, but to know who’s drawing that line. And are they drawing that line now, to further discriminate against views that don’t support theirs in the future.
AFAIK, German law does not forbid “any mention of Nazism”, it forbids “Dissemination of propaganda material of unconstitutional and terrorist organisations” and “Use of symbols of unconstitutional and terrorist organisations” including, but very much not limited to, the propaganda and symbols of the Nazi Party. But this does not – for instance, as controversies in 00s established, prohibit incorporation of Nazi symbols in contexts that, taken as a whole, are directed against them. The issue isn’t mention but promotion of Nazism, etc.
Wikipedia lists some specific cases with regard to symbols where it has, but more generally its pretty clear that Germany has not made any effort to prohibit mention of Nazis [0], even while they prohibit Nazi (and other “unconstitutional and terrorist group”) propaganda.
False. Not "any" use is forbidden. Forbidden is for example the use and display of symbols of certain organisations. The exceptions are then when these symbols are for example used in context like art, science or to explain historic contexts.
"Das Zeigen von "Kennzeichen verfassungswidriger und terroristischer Organisationen" ist in Deutschland verboten. Das regelt §86a des Strafgesetzbuches. Die Verbote gelten allerdings nicht, wenn die Verwendung der Kennzeichen "der staatsbürgerlichen Aufklärung, der Abwehr verfassungswidriger Bestrebungen, der Kunst oder der Wissenschaft, der Forschung oder der Lehre, der Berichterstattung über Vorgänge des Zeitgeschehens oder der Geschichte oder ähnlichen Zwecken dient", zum Beispiel dieser Text."
A memorial site of a Nazi concentration camp, like the one which is just 10km away from my home, for example can show Nazi symbols. The context there is the former concentration camp, where of the ca. 100000 prisoners around 50000 died. It's quite important to know about theses crimes, so the memorial site can and does display Nazi symbols.