Because three year olds, though astonishing practitioners of free will, cannot form the intent to hit or miss the Mark.
I didn't know that missing the Mark required informed intent. To intend to hit or miss the Mark, you have to know what the Mark is. Are all people sinless until they have both reached the age of reason and been presented the Gospel? That would seem to excuse some very bad people. :)
"I didn't know that missing the Mark required informed intent. To intend to hit or miss the Mark, you have to know what the Mark is. Are all people sinless until they have both reached the age of reason and been presented the Gospel?"
Age of reason, yes; presented with the Gospel, no. One needn't be a Christian in order to sin. There is an "innate" knowledge of good and evil in mankind. Its part of beng created in the "image" of God.