Murray was (among other qualifications) formerly a military intelligence officer, conducting horrendous, abusive, and unethical psychological experiments at Harvard, and Kaczynski was a 17 year old victim of his.
MKUltra was also a series of horrendous, abusive, and unethical psychological experiments conducted (in secret) by the CIA.
Ethically, Murray wasn't, unfortunately, much of an outlier; lots of psychological experimentation in the US during the 50s, 60s, and 70s was horrifying. Although Murray's background and professional history is suggestive, there is no evidence that he or his experiments on Kaczynski were actually part of the MKUltra program.
The lsd could well have broken him in a way that led to the murder and mayhem, but he was destined to be an asshole. His brother's description of his life is a tragedy of misanthropic disaster - how not to raise a child.
