I was just thinking of this short along the lines of what you post. God's grace violates our sense of justice. We think that a good person should go to Heaven by virtue of being good, but that is not the way it works. No amount of goodness is good enough to cancel out even one sin. For ALL have sinned and come short of the glory of God.
It's like this: you take a perfectly clean bandage- spotless, it looks pristine to us and you decide to place it on a wound. We might think "this is good, it will cover a wound and heal it." But supposing there is even one tiny MRSA bacteria on it, and it is slapped on the wound, the person will be infected and may die. For the most part, the bandage IS clean and good, but a little badness makes the whole thing bad. It doesn't matter if you put a dirty, used bandage on the wound or a bandage with one tiny bacteria, the person is still infected.
A person like Jeffrey Dahmer can be saved and go to Heaven, while a sweet little grandmother who gave to charity and never did anything wrong except a little gossip can go to Hell.
The difference is WHO you are trusting to get you to Heaven. You will either trust Christ, or you will trust yourself.
I read a novel called The Private Memoirs and Confessions of a Justified Sinner by James Hogg (1824). In the novel, he satirizes the idea that a saved person can go to Heaven no matter what they do. The protagonist in the novel basically says, "Whoop, whoop! I'm saved- I can do whatever I want, alright!" He goes on a bender of epic proportions. He rapes, steals, kills people. And he says, "I'm saved, so what."
In a way, this is true. In Christ, we have liberty. The penalty of Hell has been taken away. BUT, a person who is genuinely saved, the new creature doesn't want to commit all these sins. The old fleshly nature, is still sinful and desires to do whatever it wants. Because God has loved us so much, we want to love Him and seek to please Him. The Holy Spirit within us convicts us of sins. The most miserable people on this Earth are people who are saved, but not living in a way pleasing to God. It is not the person who is unsaved and good, or unsaved and bad.
God does not work on a justice system, but a mercy system. The mercy is available to everyone. Anyway, once you are saved, your Spirit doesn't want you to go and commit all sorts of sins. We're free to, but we don't now want to in our spirits (although the flesh may want to still commit sins). This is a paradox, and it is mentioned in Romans 7:15-25 better.
[video=youtube;XrLzYw6ULYw]https://www.youtube.com/watch?v=XrLzYw6ULYw[/video]