I have vague memories of a scene from the UK comedy show "The Thin Blue Line" where a bunch of bad -isms were followed by counter-examples of good -isms, but despite the episode itself being easy to find (the episode is called "Ism Ism Ism"), I can't easily find the scene within the episode.

Absolutely!

If it means you are unable to make any decisions or reach any conclusions which do not align with your -ism, then you're in a dead end.