A problem for ID is that the organisms we see in nature show evidence of either bad design or sub-optimal design. For example, the necessity for humans to get around on their hind legs causes many problems, from knee and ankle difficulties to lower back pain to hemorrhoids. Only a sadist would design creatures with so much built-in obsolescence. We get sick, we go bald, we get fat, we lose our visual acuity, our teeth fall out, our bones become brittle, our skins sag, our sexual performance fades, our brains shrink, our arteries clog, our senses dull, and our memory becomes unreliable. The appearance of such poor design can be interpreted as evidence of a bungling, unintelligent trial-and-error evolutionary process that has resulted in sub-optimal anatomical structures. Clearly, such structures appear to be inconsistent with the designs of an all-knowing, all-powerful, all-good supernatural entity. ID advocates argue that perhaps we do not know the intentions of the designer. However, a secularist can equally respond that perhaps these things just evolved in a way we have not thought of yet. Why should the first be a good excuse and the second a bad excuse?
