1. With what right we have to lock somebody in prision for doing sth. with only her/ his body and mind?
2. LSD causes no physical harm and has one of the highest ld50 of any substances known
3. Mental damages like HPPD and PTSD are real damages caused by LSD, but it isnt usual nor un preventable. HPPD is caused by abuse (consuming while on tolerance) and nbomes etc. labeled and sold as LSD. Legalization would make sure you really get LSD and a eductional instruction sold with the product would obviously educate about the substance.
4. Psychosis and DR/DP arent caused by LSD they are just triggered. They are genetic problem and LSD but also ANY other drug (including alcohol, coffein and pharmas) is able to trigger them at the same rate.
What counts for LSD counts for all classic psychedelics (LSD, Mescalin and Magic Mushrooms) but also for DMT and some other. MDMA has bigger heath issues tho its not more harming than alcohol. So yes it should be legal like any other drug too.