Are you familiar with Lamarck's Theory of Use and Disuse? He believed that if a certain organ/body part is not used, its function will deterioriate and that the more the part is exercised, the more defined it will be (he used a giraffe's neck as his example).
Maybe these people subscribe to his train of thought. I mean who would want their pinetree to fall off or their airport to cave in! Lamarck also believed that the acquired characteristics could then be passed on to offspring. Imagine if you don't exercise your Airbus then your son only inherits a Cessna!
GOD BLESS YOUR LIFE