Your in luck.. you cannot change facts with propoganda... Murshrooms are harmelss.. and Alcohol is not... its been proven and published. What I usually tell people is they can belive the lies as much as they like, but, it won't make them true.
If nobody knows exactly what every part of the human brain does, how are they supposed to know how chemicals like psyclobin effect and damage the brain. They can look at what the brain looks like, have someone do mushrooms, then look at it too see if it has changed (therefore damaged), but unless there are actualy physcial changes, like Olneys Lesions (tiny holes) or such.. how can anyone honestly tell you that drugs have major negitive effects, or positive effects. EVERYTHING EXPRESSED HERE ARE OPINIONS, SOMEONES PROBALY RIGHT, BUT THERES NO PROOF, EVEN TO WHAT I'M SAYING NOW!!!!
I refuse to talk about these kind of things with people who make ridiculous claims like this because they won't listen to reason. You're just wasting your breath and time. If people want to believe everything they hear, let them. If they can't think for themselves, let them be sheep.
Here's a bit from Erowid about LSD and brain bleeding: http://www.erowid.org/ask/ask.cgi?ID=3022 (BTW, if you don't want to be bothered clicking on ye link to find the answer, the answer is "No, it doesn't make your brain bleed, jerkass.")