The word sin, in Hebrew and Greek, is based on a hunting metaphor. Hebrew is "chatah" and Greek is "hamartia" which basically meant that the hunter missed hitting what s/he was aiming at, and thus the weapon "fell short." But this would mean that the hunter was aiming at a specific target.
A lot of Christians seem to teach that humanity is willfully disobedient to God, that in its natural state it prefers evil over good, does not seek good of its own accord and so forth. That's sin. But if sin means "to miss the mark" and pulls from a metaphor that says one misses one's aim ... doesn't that mean that humanity is aiming for the mark of goodness, but just falls short? That when humanity sins, it's not "willful" and it doesn't prefer evil and wouldn't want good without outside intervention After all, what competent hunter wants to miss his/her target? If my target is a raise at work, then I'm not going to willfully try to miss that target, nor will my natural state mean that my true desires are to receive no raise whatsoever. Rather, if I miss my target, it would be due to something that I didn't purposely do.
Yet this isn't how sin seems to get taught, but rather that humanity delights in disregarding good and justice and so on.