Why don't more people roll their windows down when it is warm?

Here in New Jersey, it’s finally warm. We all have cabin fever so one would expect everyone to revel in the sunlight and feel the natural air. I drive with all of my windows down unless it’s really hot, but the A/C is always a last resort. Could you tell me why some people drive with all the windows up when it’s 70–80 degrees with low humidity?