Because they don't know it's programming. Seriously. I dated a woman for five years who was an accountant and a spreadsheet wizard. I told her that doing what she did with Excel, she was just as much a programmer as me, and she flat-out refused to believe that she had the mental capabilities required to be a programmer.

Years after we broke up, a new company she joined required her to take a VBA training course, and she texted me and told me I was right, VBA was easy and her biggest challenge was being patient while the other students struggled.