To un-invent would be to un-think. Although, there are numerous mechanism and ways of doing business that it would be fantastic to get rid of it’s not so easy to tell us to stop thinking. If it can be conceived of, for good or ill, it will be conceived of. Since we didn’t write the laws of nature then what come out of their application was intended by a greater power, if there is such a power in the universe. Putting this aside, if I had the undiluted power to un-invent something it would processes, means and mechanisms that enable and encourage stupidity.