No, it is not "useless." It is not an exact science either. Police, witnesses, juries, and all can be fooled precisely because they enjoy neither direct observation of the events of which they treat nor direct insight into the motives of the accused.
Nevertheless I trust police forensic science which treats of a narrow line of questioning far more than I trust the typical evolutionist who accepts a tale regarding a 4.5 billion history of unobserved events and then goes on to invoke the law of the land to support his story exclusively as "science."
Big difference -- scientists have been working on the ToE for over a hundred years, and have not yet been able to show it to be wrong.
ID is not a scientific theory. The only thing scientific about it are individual scientific attacks on the ToE, and they have failed as have all previous attacks by regular scientists (which is why ToE exists today). But a set of scientific attacks on an established theory do not in themselves equal a scientific theory.