In my own life, I know people who do this because of their own upbringing. As children, they were fed convenience/non-nutritious/non-organic/etc. foods and they are okay with that. So, they chose to feed their children the same way and may think to themselves "Well, I was raised on these types of foods and I turned okay, so why shouldn't I feed my child (ren) the same way." It's an interesting type of logic, for sure.