yeh acid was used to treat certain physc. disorders (shell shock etc.) and i think even in some cases used in certain types therapy, but that might of been e, in fact im sure they did that with e but not to sure if they did it with acid
either way, acid is just alltogether too overwhelming of a drug to have any real clinical use.
oh and if im correct it was discovered in an attempt to make some new type of pain reliever. so yeh they meant for it to benefit people, but they had no intention of creating something that had this effect.... after they learned its real effects, they tried to utalize those
but in no way were they like, lets make something that will make people bug the fuck out, they just wanted to get rid of ya headache son