Olson probably didn't jump out of that window by his own hand and the joke predates public awareness of MKULTRA by at least a decade. Ask some old hippies. They all have a story of that time or two they had to prevent a friend from self harm. Not saying it's the majority experience but it's a common enough minority that users should be aware of the possibility.
The funny thing is, those old hippies may well have been doing LSD that could be traced back to the CIA's efforts to flood the 60s counterculture with it. I don't think they did that -- or, more recently, that Peter Thiel is working on companies offering psychedelic therapeutics -- because they thought it would genuinely enlighten people.
I still support legalization though. Adults can choose what to do with their bodies.