I love how experiences that are common on a variety of psychedelics, which appear to be simular to cave paintings and other very old art... Is framed as evidence of aliens, instead of evidence that humans have been eating naturally occurring psychedelics for millenia.
Given that we've found (if this Erowid source is correct http://www.erowid.org/plants/peyote/peyote_faq.shtml) 7000 year old dried peyote which was intended for consumption. I see no reason to believe that the history of humans and psychedelics doesn't extend back much further.
Taking experiences on psychedelics more seriously then evidence based science is like punishing your spouse because you had dream where they cheated on you... even though they can prove they haven't. It's thinly veiled insanity.