Tim is right when he suggests that reading involves imputing motives. A lot of our language for discussing is related to the intentions of the people involved. I can read mathematics without any concern for motives or intentions. I cannot read "Gone with the Wind" that way, for those intentions are essential to the story.
Faith is correct, that the ascribing of intentions can sometimes be offensive. Where possible, we should be as charitable as possible when imputing motives, so as to minimize the likelihood of being offensive. But we are human, and won't always succeed in being properly charitable.
On the question of ID, there are some people who believe that a science can be developed for determining intelligent design. There are others who are taking political action to insert ID into the science curriculum, even though no satisfactory science of ID has yet been demonstrated. It seems to me that it is reasonable to impute different motives to those two groups.
That said, let's not spend too much time arguing about the propriety of ascribing intentions.