So Ockam's Razor, that's what. When two separate theories can completely explain some set of observations of interest, the simpler theory is always the correct one. In science the only reason to reject a simple theory for a more complicated one is because the simple theory can no longer explain new observations or test results. ID is a more complicated explanation than a non-teleological explanation of evolution. Until it becomes necessary, ID is a matter of faith, not a matter of science.
Still waiting on the reason why I should place faith in a scientific theory that is based on 2 assumptions ? Even little stu is stumped by such a simple question. Come on you big bang gurus, the silence is deafening.
You'll be waiting a long time. Posing delusive questions predjudiced with false presuppositions is the usual style of a person intolerant of any opinions differing from his own. Here's another Stock in trade of the bigot.