Proportionality is why we instinctively feel it’s wrong to, say, banish someone from society just because they failed to pay a parking ticket or because they relapsed into addiction. There’s a deep human intuition that responses to wrongdoing or hardship should not destroy a person’s basic dignity and prospects. The law isn’t always so compassionate, but the ideal persists as a guiding light.

It allows everyone involved to feel like they’re doing something—while ensuring that no one is responsible for doing anything.