Earlier quoted context omitted.
This is speculation but it seems like we should inevitably see political factions in the US being defined in this way (and it happens in the Democratic Party too, maybe not in as obvious or extreme a way) as a result of the well-known two-party endgame of our voting system. If your faction isn’t one of the two, your choices are to join one or be irrelevant. So you jump on the bandwagon with whoever you hate least, an…
It may also be specific to conservative movements, given that by definition they oppose some change in society and so would naturally be diverse in their reason for opposing it (possibly more so than the supporters would be diverse in their reasons for supporting it).
They could dynamically band together on a per-issue basis and have more reasoned discussions focusing on those issues instead of making sure to pronounce “shibboleth” correctly.