Does everyone downvote all medical speculation in the numerous health threads on this site?
No.
It's fine for people to speculate about medical ideas, legal ideas, etc. Especially on a forum like this where there is no pretense that people are offering genuine legal advice.
Personal attacks are not ok on HN. I appreciate your concern for the quality of the site, but doing this is one of the worst ways to destroy itt. So if you'd please review https://news.ycombinator.com/newsguidelines.html and follow the rules when posting here, we'd be grateful.
carbocation is right about the underlying point, btw. This is an internet forum, the purpose is good conversation, and speculation is a normal part of conversation. It can of course be dumb and low-information, but it needn't be.
No.
It's fine for people to speculate about medical ideas, legal ideas, etc. Especially on a forum like this where there is no pretense that people are offering genuine legal advice.