Huh. Learn something new every day.
I always assumed that for convictions, a minor is deemed to be less able to reason than an adult and therefore requires either leniency or some sort of consideration similar to how the statutory minor age works. Because otherwise, why have a juvenile system at all? If we think that they are young enough to reform, then what is that really saying? That’s saying, I think, that we deem their character and ability to judge right from wrong to still be malleable. That says, we didn’t think they had the full ability to begin with similar to the age of consent.