We know how to build a simple Ford Model T car. Now let’s build a factory inside this car, so that it can produce Model T cars automatically.
The argument for ID could not be clearer: Unintelligent forces cannot rearrange atoms into computers and airplanes and nuclear power plants and smartphones.
The re-usage of highly similar and complex parts in widely different organisms in non-treelike patterns is best explained by the action of an intelligent agent.
Eyes with lenses are believed to have evolved independently multiple times, but all evolutionary scenarios face insurmountable barriers.
Think of cars. A Tesla and a Cadillac share many features — but of course, none of that means that Teslas blindly evolved from Cadillacs, or vice versa.