That might be troublesome, except for the complete lack of alternative hypotheses, plus a supporting infrastructure from other sciences.
As long as ID advocates behave like Scientologists and refuse to reveal the secret identity and methods of the Designer, evolution is the only game in town.
"As long as ID advocates behave like Scientologists and refuse to reveal the secret identity and methods of the Designer, evolution is the only game in town."
We don't know the identity of the people who built Stonehenge, nor their methods. Likewise, while we know (in general) the identities of those who built the pyramids, we don't know their methods. Yet in both these cases we can make design inferences.