Something many people do not know about.
Wasnt he involved in writing a song for some rock group that became a semi successful song?
Was it a CSN&Y song?
Beach Boys
That’s my recollection, Neil Young tried out a Manson song and tried pushing it on the other group members who said no. Manson was hanging around them given access by Young. Later they told Young to ditch him.
Manson was verifiably insane. Young let it slide.