Not true.
My friend woke up handcuffed to a hospital bed after a bad trip on mushrooms. He saw his dead body in the street and was convinced he was dead and a ghost. He then went running around Manhattan traffic jumping on cars.
An English teacher in high school witnessed her friend jump to her death from a balcony after taking LSD. The woman said she felt light as a bird, took off running, hopped up a chair and dove over the railing to the pavement 20 feet below. She broke her neck.
I am not saying psychedelics should remain banned. But to casually call them harmless is incredibly irresponsible. They need to be taken under supervision by people with experience. This is called trip sitting. Not all trips are good as emotions and state of mind can effect the outcome. Things can go wrong fast. Be safe.