I think it might help to flip the argument on its head. If you are a low income person struggling to make ends meet - should you have to forego a meal or two ? Is it fair if a richer person does not have to do the same ? All things considered I’d bet you the higher wealth person still has the less impactful fine.
It's not like speeding tickets are inevitable. I've been driving for over 17 years and I've never been pulled over once (knock on wood). But sure, I don't mind proportional speeding tickets (I never get them), but I think it's a slippery slope of socialism where you start thinking everything should have proportional costs. Why should rich and poor both pay $3 for a gallon milk? Shouldn't the rich pay $30 for a gallon of milk? Heck, they are so out of touch with food costs anyway they probably wouldn't notice.[1]
People make mistakes and exhibit wreckless behavior every once in a while. Unlike milk, the value of a ticket is not set by markets. It is a financial instrument used to discourage behavior. It's really not too dissimilar to a tax. We already have all kinds of progressive taxes - this really isn't much different.
