[whamlastxmas]

Being charged the same percentage of income is still the same punishment. It’s a non-controversial concept in economics that there is a marginal utility to money, as in, if you have a billion dollars, then getting an extra hundred doesn’t give you more utility. However a struggling family would be thrilled at a hundred bucks and maybe that means eating for the next several days. These people should not be charged with the same static dollar amount.

[pc86]

It seems disingenuous to talk about marginal utility in this context, you're bringing up a non-controversial thing to try to make charging different people different dollar amounts for the same crime also seem non-controversial, which it is certainly not, at least based on the comments here.

You can say it's the same percentage so it's the same punishment, but you can't pretend this isn't a recent change in jurisprudence.