From a company/corporate stand point it makes perfectly good sense to completely scrap most/all of the airplanes, and related spare parts, if any.
This is all now just residual un-needed production inventory. Might be more costs to the company to sell components than profit to be realized. No costs to warehouse stuff not needed. No potential liability head aches down the road.
Does Cessna even sell standalone engines, avionics, instruments and other similar non-Cessna proprietary spare parts? Why retain stuff that is not sold as part of the core business? Scrap it and take the tax write off.
If the stuff that manufacturers scrap on a daily basis could be seen it would make eyes roll. But in the scheme of things it makes sense to do it.