Exactly! Both theories are based in science. Students have a right to learn both theories and decide for themselves.
I regret to inform you that there is actually no "theory of ID". So it might be a bit difficult to have students learn it.
People are overreacting to ID as if it is proposing a return to the belief the world is flat.
In the manner in which the ID movement is attempting to undermine actual scientific discoveries and methodology, it might as well be.
just a side note: it would be rather difficult to "return" to the belief that the Earth is flat, as that notion was developed in the 1800's IIRC by a Frenchman and Nathaniel Hawthorn as an Enlightenment slam against religious perversion/retardation of knowledge. No evidence exists that any educated person since (at least) the Classical Period believed the world was flat.