[dude with glasses in a communist t-shirt, arguing] I’m the only leftist here, your opinions are TRASH
[dude holding a theory book on smug, arguing] Read theory you losers, you’re all WRONG
[dude in an anarchist hoodie, arguing] Nuh-uh, I’m the only leftist here, you’re SHITLIBS
[the three dudes are now caught in a cartoon fight, glasses gone flying, punches everywhere, while a firing squad of nazis are targeting them with rifles]
[a confused nazi asks] Why… why are they still arguing?
How do you know that isn’t confirmation bias? We have no idea how many leftists there are that see purity testers and decide to not engage.
It’s a similar to MAGA in a way. MAGA’s biggest problem, as an ideology, is that it revolves around blind loyalty to a single idiot and therefore the entire movement starts and stops with his whims, no matter how contradictory, damaging, or nonsensical. You could say it’s confirmation bias that I have this opinion, but I think given recent events, this opinion does have a basis of fact to it. The same applies to the left when it comes to purity testing. It’s really not hard to see how prominent purity testing is in leftist discourse.