Extremists? No, as I said, I am worried that they do not appear to be "extremists", but that the attitudes they represent appear to be, in that time and that place, pretty mainstream, and that they are vile attitudes.

Extremists don't really matter too much, in the final analysis. They can cause mayhem and so forth, but so long as they are on their own they can never win. It's when the ordinary people come on board that things change.

That applies whether the extremism involved is seen as "good" or as "bad".
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I think gnu is very likely right in predicting that the centre will very likely get bombed. And a lot of "ordinary folk" will take satisfaction from that happening.