I dunno, maybe the right to face your accuser? Right to a speedy trial? These tickets are not negotiable. You pay the fine or you swear an affidavit that your car was sold or stolen. There is no "Not Guilty" option.
Can't a person still take his case to court? Is it not possible to argue that the cameras are defective, timing incorrect, photo is blurred and doesn't clearly show the person's vehicle, etc? I have never read an article anywhere that said the results of a camera taking a picture of someone going through a red light were "not negotiable." Do you have a source for that?