Why can't these idiot judges be shown video of Terri?
The idiot judge(s) can't see the video in front of them in the courtroom. The idiot judges are told by Michael's chosen doctors that what they view on the videos are merely reflexive noncognizant actions and are, therefore, not responses. Thus, these idiot judges believe that Terri is in a persistent vegetative state, the legal reason to allow her death by dehydration and starvation. The mere fact that other doctors disagree with that is not included in the evidence files of Judge Greer's courtroom. He never lets truth get in the way of sentencing someone to death.
Judge Greer was shown a video of Terri interacting with people. He couldn't see it because he's legally blind. A fact that he did not disclose, as required.