The old version is still terrifying, though. One of the Marks (Kermode/Cousins) introduced IOTBS on that BBC2 film series they did, and the bookend segments where Kevin McCarthy is talking to the local cops were added on the studio’s orders because otherwise they thought it was too downbeat. (Kevin McCarthy is also in the first remake.)
Just watched Winter Solstice, a play from Germany (translated) about extremism and how it inveigles its way into society. Genuinely chilling.