Why are people stuck in the 20th Century in their beliefs and understandings of the modern world? The 21st Century is already radically different in many areas to the 20th. What's holding them back? I know history doesn't exactly repeat but does rhyme, but really...

Hypnotherapy:
Hypnosis can be a boon to treating phobias, depression, stuttering, anxiety and many other conditions.
Hypnotism has been practiced for thousands of years, and for most of that time it was associated with magic, witchcraft, meditation, charlatans and entertainment.
Only in the past century have the medical and psychological benefits of hypnotherapy been documented, scientifically proven and found to be significant. I believe cruel authoritarian primary teachers are significant as well. Psychiatrists owe much of their income to bad parents and teachers.
or is this being eristic?