It is really amazing how closely purpose and design are related, and their further relation to the problem of evil. Before someone can design some device, they must have a purpose- they don't just start throwing stuff together and find a purpose for it later. Likewise, end-users look at devices and see specific purposes for them. The sane end-user would not conclude that the useful device was not designed. Granted, some devices take on purposes different from the original; however, the device still has purpose, otherwise it would not be in the market.