While I certainly understand why an ardent evolutionist sees a connection between creationism and ID, it makes no logical sense why they would rule out design a priori. The one and only reason for ruling out a Creator or ID's designer is that the naturalistic assumptions of evolution would be refuted. Therefore evolutionism must abandon objectivity and deny what we observe rather than explain it.
'One and only'? Really? So if I say that the reason I discount ID as an alternative scientific theory is where and how it is being used - not to foster real research, or to develop a better understanding of the world, but to alter the way we teach science in schools - then that would be a second reason, and I've falsified your statement, no?