there are a lot of people who have turned ufology into a religion where they setup unquestionable standards for everything. to them certain things area always real no matter what and certain things are always frauds no matter what. it's people like that which really make the rest of the paranormal community look bad. you're right though, sharing information is the best way to investigate, not become insular.
but that's what shows you they're crazy, the fact they don't tell you what the misinformation is, because they can't, they just have an irrational paranoia.