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is misleading, I think it's the other way round - once You've been radicalized enough it's logical to go underground for further networking and planning.
Yes. Very worrying nevertheless.
About snow, man my country could really help out with winter accomodation. Simple military tents with the stove pipe burner, sleeping places that are isolated from ground etc. It's actually quite fun to stay in a good tent like that in the forest, if you're doing it for the fun and are not a refugee or in the military.