While this is true, it is also true that fines that are small relative to your wealth essentially mean those activities come with a convenience fee for the wealthy. Having fines that scale with income or similar maintains the severity of the infraction for people of all incomes.
I think a lot of it is feelings of helplessness. You’re on a freight train that appears to be running straight at a cliff, you can’t stop it, you can’t even make it change course, and even with that looming in the distance, it feels increasingly hard to make the situation any better before you hit that wall. Even having proof that you can improve your circumstances can remove that feeling of helplessness, and that seems to be very much unavailable for people living their relatively comfortable, if stagnant, lives in much of the developed world. If your life isn’t where you want it to be and you don’t see a path to achieve that, it’s very hard to feel happy.