I agree the automated systems are impartial, but they cannot ID you without it becoming super invasive.
In Europe and places with more omnipresent cameras, the laws are such that they can ticket you without needing to ID. The car gets the ticket so to speak.
For a criminal case, yes, they need to prove "beyond a reasonable doubt" - which would require that you are positively identified as the driver.
For a civil case, they only need to prove by a "preponderance of the evidence" - which is a much lower standard.
This is why tickets from red-light cameras in many states are zero-point citations. You're still charged a fine, but there's no finding of guilt attached to the offense, which keeps it away from being considered a criminal matter. (This is the same way parking tickets work.)
I don't know what happens if the other person denies it though.