I think that you should look at the fact that Jesus had NOT yet been crucified so as of yet, there was no salvation and that this was a parable spoken by Jesus himself. Also, the illustration shows that this parable is speaking about those who think they know God, but do not, and if there are two who do not truly know God, the one who at least can see his own sin is the one who is much better off that the one who only sees the sins of another.