Because it levels the playing field. A $250 fine isn't going to deter someone making $250,000/yr like it would someone making $25,000/yr.
But $2,500 might.
" Fines are a dominant feature of American life, as certain as death and taxes. In every facet and context, they play some role in regulating behavior and expressing society’s moral reprobation. Perhaps because of that ubiquity, the way we impose fines is taken for granted, as if it were a law of nature that fines exact the same price from every offender, no matter her income. But as this Article has suggested, there is an alternative to the status quo, and it aligns at least as well with our intuitions about justice and the purposes of punishment. As more people awaken to the burden that criminal justice debt imposes on the poor, there may be an opportunity for a larger reconceptualization of financial sanctions. At a minimum, the tariff fine is an aspect of our justice system ripe for experimentation. "
Now every cop that punches number, or any admin, or basically anyone with a terminal gets to know what I make and then judge me for it?
what if I had a good year last year and am losing money this year? Now I have to pay a price for being successful for a limited length of time??
No thanks to that reality.