This is Adam Curtis you're dealing with, check youtube for some of his other brilliant (& kinda far-out) documentaries
It's not considered his best stuff, All Watched Over By Machines of Loving Grace is probably most relevant to HN and all three episodes are well worth watching.
IMO his best stuff is on the coincidence and movement of political power. Check out The Trap and The Mayfair Set. The Power of Nightmares is good too.
Now go watch the darn thing.
(spoiler: it's a parody of Curtis's methods)