Injustice, Negative, Mistake
A criminal has done an injustice on the world or other people. Being a criminal is a negative thing, and even if it was just a mistake, it was still a crime.
Think of all the criminals you know. Even if what they did was a mistake, it was still some type of injustice, right? It was something the rest of the world sees as a negative thing.
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When you commit an injustice, you'll know because heat (ひ) fills your body. Maybe you've never done any kind of big thing, but when you make a mistake your face fills with heat and you turn red!
This is the heat of embarrassment, of knowing you did something negative or wrong.