All-or-none law works in science, in life?

The roller coaster of life of survival.

Everybody has some goodness in him. Sometimes, he thinks he is doing the right thing. Well, from where he is standing, that is how it looks to him. He has to protect his own interest or that involves people around him. He says charity begins at home. When a family is taken care well, society and humanity will take care of itself. His servants may agree to his action and those at the receiving end of his actions may abhor. The victims may cry for help and may curse for him to burn in the eternal flame of hell. They would refer to history and scriptures to justify their actions or inactions.
At the end of day, at the end of life, the sums of things done in a man's life can never be either black or white. It can only be in shades of grey. It seem totally unfair to gauge the goodness (or evil) of one's action using a 2D yardstick with pre-set rules which never changes seasons over seasons and generations over.
Surely at the Pearl Gate, the dichotomy cannot be so straight forward. The deeds done in a lifetime cannot be all be easily classified - thumbs-up or thumbs-down. And it seem unreasonable to be given a new slate just because you repent at the last minute after a trail filled with heartaches, misery and disappointments. An all-or-none rule works does not seem the plausible way of doing things.There must be a halfway house between heaven and hell.