Some people simply don't care about religious details. They don't care whether or not religious history is pristine or messy; they don't care about trying to figure out if something a prophet said is the word of God or personal opinion; they don't care about lots of things that drive more analytically-minded people bonkers. They really just don't care. Many of them see things in black-and-white, and many others just don't care about shades of gray.
It’s VERY easy for those of us who care about historical detail and nuance and every issue to attempt to impose our own expectations and perspectives on others who see things differently or just don’t care like we do - to juxtapose a different black and white in the name of seeing gray. If we insist that ALL need to see the gray, that really is just another black and white viewpoint.