I agree with your point.

Going offtopic: The "health benefits of circumcision" bogus has existed for decades. The search engines are returning the results of bogus information, because the topic is mostly relevant for its social and religious implications.

I am related with the topic, and discussion is similar to topics on politics: Most people don't care and will stay quiet while a very aggresive group will sell it as a panacea.

the problem isn't that search engines are polluted; that's well known. The problem is that people perceive these AI responses as something greater than a search query; they view it as an objective view point that was reasoned out by some sound logical method -- and anyone that understands the operation of LLMs knows that they don't really do that, except for some very specific edge examples.