So based on your POV there shouldn't be anyone in prison. If all they have to do is ask for forgiveness and you will keep forgiving them, that would make prison obsolete. The question is, when is enough enough? Where do you draw the line? God knows everyones heart, everyones intentions, everyones true motives, so he is in a better position than us to be able to determine where to draw the line.
Huh?
So, as I said above, If modern society had the same mindframe that you have, there would be no one in prison. All you would have to do is say "im sorry" and you will be forgiven. What kind of life would that be like if someone could take the life of one of your loved ones and all they had to do is apologize and that would be sufficient enough to let them off of the hook. Would you want to live in this society where there was no accountability for certain actions? If the answer is yes, then if you are ever robbed there is no need to get angry with the robber, if he is ever caught, plead on his behalf and tell the court "I am willing to overlook this if this man just simply say he is sorry". If your answer is no, and you WOULD'NT want to live in that kind of society, then you and God have at least that much in common, which is why things are the way that they are.