Haven't seen the documentary, but they sound like a more overt version of the mob who used to have a stall outside my North London supermarket. Come 9/11, I realised from the telly they were the Finsbury Park mosque lot.
After seeing them a few times, I'd stopped to find out what they were about (pre-9/11). It rapidly became clear I was NOT their target audience. They didn't like me clogging up the front of their stall. And they didn't like being challenged on the stuff they came out with. Didn't stop me, but doubt I had any impact.
Indeed one of the more high-profile foiled plots was uncovered a few hundred yards from my flat.
I only mention this because I last week learned that apparently the Cologne attacks can be blamed on lefty feminists, especially those living in North London. And that sentences can be started, "I'm a lefty BUT I'm willing to criticise things in other cultures."
Erm, OK, I must have been doing it wrong all these years then...
(PS An aside to this thread, but what is it with "North London" as some sort of code for "floating island of unreality and privilege"? Is this some fictional North London which doesn't include Finsbury Park, Haringey or Tottenham? Or Seven Sisters or Hackney? And exists primarily in the imagination of people who actually do live in comfortable, leafy, small towns and don't get kept awake by the police helicopters most nights?)