lukeprog,

I disagree with the claim that Hitchens' objection invokes the why-regress as it applies to science. It invokes an infinite regression that is a consequence of the Intelligent Design claim (things above a certain threshold necessitate a designer); much like Maitzen invoking an infinite regress that might be entailed by applying the "so what" question to every purpose statement.

To make this clearer: The problem with Intelligent Design is precisely that it demands an explanation exist, and that the explanation be a designer. Hitchens' objection is in-line with us not requiring an explanation for the fundamentals.

Science is not subject to the same infinite regress, because science does not set a rule that everything must have an explanation, and certainly not an explanation of a certain kind. Science may define a certain class of phenomena as having a certain explanation, but it never sets the explanation as necessarily requiring the same explanation to explain it. Hitchens points this flaw as a logical consequence of the ID claim.