The theory of evolution doesn't vaguely cite "natural causes" in the same way ID vaguely cites "intelligent causes". The theory of evolution presents specific natural causes.
As if the theory of intelligent design could not possibly cite a specific intelligent agent! It is actually capable of more specificity than the theory of evolution. It posits a single, almighty, intelligent agent, not vague "forces of nature;" not a concoction of natural selection, random mutations, unguided forces, etc.