Bad Design Means No Design
This argument assumes an infallible knowledge of the design process.
Some, for example, point to the cruelty in nature, arguing that no self respecting designer would set things up that way. But that need not be the case. It may well be that the designer chose to create an “optimum design” or a “robust and adaptable design” rather than a “perfect design.” Perhaps some animals or creatures behave exactly the way they do to enhance the ecology in ways that we don’t know about. Perhaps the “apparent” destructive behavior of some animals provides other animals with an advantage in order to maintain balance in nature or even to change the proportions of the animal population.
Under such circumstances, the “bad design” argument is not an argument against design at all. It is a premature — and, at times, a presumptuous — judgment on the sensibilities of the designer. Coming from theistic evolutionists, who claim to be “devout” Christians, this objection is therefore especially problematic. For, as believers within the Judeo-Christian tradition they are committed to the doctrine of original sin, through which our first parents disobeyed God and compromised the harmonious relationship between God and man. Accordingly, this break between the creator and the creature affected the relationship between men, animals, and the universe, meaning that the perfect design was rendered imperfect. A spoiled design is not a bad design.