My apologies, my previous statement was an implication and was not explicit.
I think that any form of thought or activity that lies outside of the acceptable norms of a society can be painted as extremism by the majority with disastrous results, and thusly the results are so abhorrent to conclude that society is NOT the best judge of what is extremist or not because calling something extremism or someone extremist often connotates moral judgment on said actions or persons.
I would dispute that you can’t disect moral judgent from the invocation of the term extremism.
Btw, if I were you, I would next point out that if my claim that society is not the best judgement of extremism, then ask then who or what is?
To which I would respond that we should throw out the term as it actually just refers to those who want changes to society that upset the paradigm under which it is founded.
My opinion is that a society that is based on inclusivity as its core value is probably better than the one we have right now. With the following caveats:
Said society would need to have an addendum that it need exclude those who would tout exclusivity and violently express the necessity of exclusivity in preferential treatment of one group over another. This society would have to fundamentally acknowledge that speech, left unchecked, can be violent even by inference.