I was talking with a high school teacher today about cycling. He says a number of students might be inclined to ride to school if they could safely store their bikes. They have some fairly pricey mountain bikes and they don't want to leave them in the racks all day. In other words, they like to ride, but it's strictly recreational for them.
I hadn't thought of a lack of secure bike parking as a reason for not going car-free or car-light.