I lived in Calgary in the late 80's for a couple of years. I remember driving around, and Ogden was the strangest place. Yeah, 1 road in and out. I believe I too got turned around there ..
9/11, we had different reactions and beliefs. So we saw it differently. With 1/2 an hour of the first plane hitting my BS detector had gone off the scale. The minute I heard, way early in the attack "This has the earmarks of Osama Bin Laden" .. well, the patsy had been identified. It was just too pat, too convenient. When I saw the buildings come down it looked like a demolition to me, the buildings went down in the path of what should have been greatest resistance. And then WTC 7 going down, that was the icing on the cake. It was obvious, to me.
But getting back to the idea of why people can't see the truth. I believe it is because they have a lot invested in their world view. The Christian has not only been guided to see things a certain way, it has been reinforced and reinforced, and anything "outside" has been branded as "The World" and "Satan". So even if maybe a doubt creeps in -- well, they want to be good and that doubt, that truth that they see -- is evil. Simplistic terms, but I think that is pretty well what it is. And then they use the Bible to "prove" things. A book written thousands of years ago by a mix of people, some intelligent, some not so much, most very religious -- people hearing voices etc. Today some of these guys would be in institutions.