That being said, I've read some of the details of the particular fees/fines/etc and they are often times a wholly unjust prison trap that is difficult to escape. Laws that allow that sort of thing should be changed to provide reasonable cost offsetting onto people who commit criminal acts without creating nightmarish situations that people can't rationally be expected to deal with.
The costs of processing criminals need to be borne by the society that chose to create criminality as a concept. That cannot be part of the debt because they absolutely cannot pay it.
Except, you know, by engaging in higher-profit criminal activity. The whole idea is moronic on any practical level. It exists only to maintain an underclass.
Surely you're not saying that we can't levy fines instead of prison time for crimes. Are all fines therefore unjust because some people can't pay them?
See, I agree about prison debt traps to an extent, but I feel like this topic always goes off the rails from "debt trap bad" to "prison is the only punishment for crimes, fines are unjust because poverty."