I could almost forgive them for not having these various pieces of knowledge in their repertoire. The big issue is the fact that they weren't sufficiently critical in their approach to actually check the things they were not 100% sure about.
We had a teacher at school who used to insist that education was "not just about knowing what you know, it's about knowing what you don't know". A headache-inducing maxim, but a true one. They should have stopped and done their research if they had even the teensiest bit of doubt. Gah.