For a mind-body without direct experience of trans-human consciousness, it would appear as insane. 
The potential and power available is unfathomable to 99.99999% of humans. 
At the human level, the deeper fears are not of our limitations, but of our potential. The few humans that have tapped into these realms will resonate with some humans and will be ridiculed by others. 
Imagine being an ant and expanding to the conscious level of a human - and then trying to  explain what its like. Your fellow ants will think you cray cray when you try to explain solar systems, algebra, countries, oceans, expansiveness of earth etc. Kinda like that.