They try to share experiences, about certain possibilities of the human mind, and how they feel.
But those are weird, complex, possibly frightening, and they are also sometimes mis-communicated[1]. Also - they challenge deeply held personal beliefs.
So it's natural that people will resist.
[1]The nature of enlightenment was always hard to explain. Until you listen to Gary Weber(http://happiness-beyond-thought.com/):
He explains it simply - you know that internal voice, that's always focused about "I"? and always remembering the past and making-plans/dreaming about the future ?
Think about a time you'd had less of that ? so it's possible to make this voice disappear.
And than - you think when you want to think, when you need ideas they sometimes pop into you head, like regular creativity , but most of the time - peace.