I have just noticed that in many online communities, you couldn't easily filter on extremism because, based on the community values, expressing the wrong opinion is "trolling" but responding to that opinion "die in a fire you fucking asshole" is a top-rated comment. I don't even think these are outliers, a lot of communities are run like this.
Also, possibly this comment would be a false positive in some places because I included extreme text as an example.
Your point is very well taken. The choice of whose community values to use is an important one. If your goal is to try and exclude some actually popular but perhaps embarrassing opinions, then you are likely to need to incorporate some of the values of other communities where this sort of speech would be filtered.
Applying r/SRS standards to r/RedPill would be an extreme example of this, and a good thought experiment. Could you model what kind of karma score a RedPill post would get on SRS? How would it change what a discussion page looked like?
Also, possibly this comment would be a false positive in some places because I included extreme text as an example.