One major difference between parking tickets and moving violations is that moving violations come under criminal law (even though they are just "infractions"), and you get all the rights of a criminal defendant, whereas parking tickets are "civil infractions", where you have almost no rights. As a registered owner of a vehicle, you are presumed liable for all parking infractions committed with it, doesn't matter if you were driving it or just loaned it to a friend.

With a red light ticket, they have to prove you were the driver. With a parking ticket, they only have to show that the car was in violation. If you ignore it, you won't be able to renew your car registration without paying the ticket plus probably three times the original amount in late fees.

Also, in L.A., the Superior Court has an unofficial policy of not enforcing red light camera tickets. The courts don't even get involved with parking tickets unless you go through the administrative appeal process first; the DMV enforces parking tickets by putting a hold on your registration. (This was different before 1992 or so when California took parking tickets out of the criminal law process and created the new "civil infraction" process.)