Not saying you're wrong, but just shouting MK Ultra has become somewhat of a catchall for things people can't really wrap their heads around (such as somebody just being insane). It looks like the author of the book even admits he really has no evidence of those claims.
"Though he’s upfront about the fact that he’s unable to prove it, O’Neill suggests that, based on evidence he uncovered, Manson may have been part of a larger, secret CIA initiative."
https://decider.com/2025/03/07/chaos-the-manson-murders-netflix-doc-mk-ultra-cia-dr-jolly-west/