Why does the Catholic Church promote the bodies of certain individuals as "incorruptibles" when their bodies have clearly corrupted? Further, why does the Catholic Church hide the corruption and artificially delay corruption, such as a rubber mask in the case of Padre Pio to hide his decayed head, or storing bodies in environmentally controlled coffins, or injecting with formaldehyde? How is the latter "incorruptible" evidence of anything supernatural, when the natural corruption is either hidden or delayed through very non-supernatural means?
For example this Wikipedia list, almost all the "incorruptibles" are described as corrupted and requiring wax to cover up their face and hands. Why does their true state need to be hidden?
If they are all corrupted, why does the Catholic Church maintain the appearance of incorruption?