They types of people mostly known as serial killers were NOT the same types of people involuntarily committed before the 60’s for mental health reason. Efficient, covert serial killers, those wily enough to avoid capture for extended periods of time, are highly functioning individuals, many of whom can blend in with society sufficiently enough to avoid detection. These would not have been deemed mental institution material by pre-60’s standards.
Consider Dennis Rader, Kansas’ BTK killer, who was a productive family man, church elder, boy scout leader, and supervisory city worker.
Fair enough.