I hide any thread that deals with education, education funding, or teaching in general for that specific reason. It really saddens me to see that this place is full of so much misinformation and anecdotes made into data (and usually with much more self-confidence than other forums, which is interesting to me).
It's why I generally only ask questions, or ask for clarification instead of directly challenging something I think might be wrong now in threads that aren't related to something I have deeeeep personal knowledge of. I know when I'm out of my area, and don't want to add to the ignorance.
Challenging something with a question about it, is not adding to ignorance - if a statement/study/fact/belief can't hold to up to questions, from actual opposing critics, what's the point of that position existing?
Being all "PC" and "nice" about stuff that is what it is, or isn't -- THAT adds to ignorance.
A great habit - especially when your question is an irresistible, easily-addressed homerun to a domain expert wandering through the thread looking for an entry-point.