Guitarstv, you are using a laypersons dictionary in discussion of legal concepts. See https://en.m.wikipedia.org/wiki/Guilt_(law)
An offense has a factual aspect “did you drive faster than the posted speed limit?” And a legal aspect “do these fact amount to breaking the law?”. As stated I agree it’s unethical to lie about facts. But pleading of not guilty is not a statement of facts. It is more akin to saying “prove it”
Fundamentally, I don't really see much distinction here. From the article you posted (which does not correspond with your interpretation at all):
'"Guilt" is the obligation of a person who has violated a moral standard to bear the sanctions imposed by that moral standard. In legal terms, guilt means having been found to have violated a criminal law'
When asked if you are guilty or not in a case where you are fully aware that you violated the moral standard of speeding, it is dishonest to respond 'not guilty'. Saying 'not guilty' is saying that you shouldn't bear the sanctions (in this case typically a fine) because you didn't do the crime. It's not telling the court to "prove it".
No, the legal system's approach of innocent until guilty is a fantastic idea! But that's referring to how the court and legal system treat you. If you committed a crime, you know that you did it. There's no need for proof to yourself. Claiming that you're not guilty of the crime is therefore dishonest/unethical.
I know that? Hell, no. The law (especially case law) is enormously complex. I don't know that, you don't know that.
I am not a lawyer specialized in this area, therefore I am not qualified to determine whether I broke the law or not. Innocent until proven guilty.
Claiming you understand the law without passing the bar and specializing in that area is unethical.
Let me get this straight. You are driving in your car. You see the posted speed limit. You drive faster than the limit. You are pulled over for speeding - resulting in a ticket. But you don't know that you've broken the law unless you have a law degree specializing in speeding tickets?
You really think that way?
Who says the speed limit was set legally?
Who says the speed study was performed correctly?
Who says the sign met notification requirements?
Who says the sign was placed in the proper location?
Is there a history of racial/gender/etc discrimination in enforcement?
Did the officer actually measure the wrong vehicle?
Was the equipment out of calibration or used outside approved parameters?
Et cetera.
I'm not a lawyer. There are tons of reasons the speed limit or its enforcement might not be legal at all.
I guess that my premise assumes the operator of the vehicle is paying attention to what he or she is doing. That would mean being aware of the speed at which his/her vehicle is operating and paying attention to the posted signs. If you see a sign saying that the speed limit is 50 and you operate your vehicle at 70, I feel that you are morally obligated to plead guilty to a speeding ticket.
If you honestly believe that the ticket was received unfairly (due to discrimination, equipment malfunction, etc.) then by all means, fight the ticket. If you're unsure if you broke the law because you were operating your vehicle in a negligent manner (distracted, playing games on your cell phone, drunk, high, etc.), I think that you should mention that to the court when making your plea.