One explanation I've seen is it's the need for emotional, and now intellectual comfort. The average mind is small and can deal with few ideas at a time. When su

One explanation I've seen is it's the need for emotional, and now intellectual comfort. The average mind is small and can deal with few ideas at a time. When such a mind is exposed to a different idea, it's already overwhelmed with the few it already has, and instinctively rejects the new idea.