There is a public perception that the effect of this dirty experimentation (that also involved help from good ol' dirty German Nazis, which BTW could not have been any less evil or murderous than TK, but were spared the kind of prison term that he got) was not sufficiently considered during TK's trial and sentencing.
Another aspect to TK's story is that prior to becoming a murderer he was involved as a subject in the "MK Ultra" human experimentation.
https://en.wikipedia.org/wiki/MKUltra
There is a public perception that the effect of this dirty experimentation (that also involved help from good ol' dirty German Nazis, which BTW could not have been any less evil or murderous than TK, but were spared the kind of prison term that he got) was not sufficiently considered during TK's trial and sentencing.