Actually, some of the happiest people I know are Amish.
Holy fear of knowledge isn't irrational. Irrational fear is.
Shalom.
All fear of knowledge is irrational.
The Amish do not fear knowledge, they just shun the use of some of it for themselves. They certainly aren't luddites, up in arms warning the world about the dangers of knowledge and its application, and attempting to stop either the pursuit or use of it by others.
Hank