Actually, the fine is excessive and unfair. We have red light and speed cameras here. Before any ticket is issued, the photographic evidence is reviewed by the local police department and a decision is made by the police whether or not to issue the ticket. For speeding here, it is not "written" into the law, but generally a transgression of under 5 mph will be ignored if there are no other extenuating factors involved (e,g, unpaid tickets on that plate) to allow for, among others, mechanical error. A red light ticket will be reviewed to see if the driver made an effort to stop before going through, and so on. And, anyone ticketed has the right to appeal and go over the photographic evidence in court. You must be sent the ticket within a specified time frame (30 days in Philadelphia), and you then have an option to enter a plea and contest this within the next 10 days. Our traffic court has been cleaned up, it's part of our state's municipal courts, and it is not a rubber stamp for tickets.
And this is where the unfair part enters in. By the time this has been tracked back to the rental company and you have been contacted, you no longer have this option, nor the option to pay timely, and generally it is completely impractical for a foreigner to come in and protest this through court channels had they been notified timely. I am actually shocked to see that you were given the chance to pay the basic fine, rather than the late fee. I think that's the first time I've seen that here!
Now I am not saying it is policy through Europe, but is there any reason for the jurisdiction of authority to not just issue every ticket involving a car identified as a rental (readily available to them) and see what they get back? I am all for the idea that if you made the violation you need to pay the fine, but there also needs to be due process.