I think a lot of it has to do with fear. Not like horror movie fear or anything, but those little nagging fears, the kind that hide in the back of your mind and tickle your ears.
In order for a person to be truly tolerant, and to think for the least little bit that someone with a different viewpoint might be just a little bit right, is the same thing to them as admitting that they themselves might be just a little bit wrong; and a lot of people can't deal with that personally as far as religion is concerned.
I see good in many belief systems, in many religions, in many types of spirituality (not the same as religion) I am actually glad people can have a place to debate, it challenges their beliefs, helps them look inside, and helps others think. And I believe there is much more to a person that just one perspective in a small part of their life, as it can vary so much person to person.
I think actions speak louder than words and sometimes what people don't say, says the most of all in the big picture. I never get too involved or too personally invested in internet debates that my feelings get hurt (you can take that concept from the Four Agreements book, more New Age than anything else, neat book). Dragoriana don't get your feelings hurt!!!! Keep sharing and don't feel bad about it!