The nonsense of forgiveness

Someone hurts another. And then ask forgiveness. It hurts a second time, since the wounded guy, based on his education feels compelled to say "OK, I forgive you", but the injury he / she has suffered may never heal. The end result is that the bully feels vindicated and the victim just received another shot.
 
This behavior has deep roots in the Christian religion, going so far as to say "God forgives you if you confess your sins on the last day of your life".
 
How brutal is that? A murderer will be pardoned so confessed, a hedge fund manager that ruined thousands lives getting rich will be pardoned, thieves, ruthless dictators, liars… I am just wondering how Heaven will look like?
 
And at the other end, you have honest and caring people who have refused to believe in a God who has never sent a sign of His presence in a convincing way. These guys can end up in hell.
 
What I see here is the wicked of Heaven laughing good boys in Hell.
 
Where does this concept come from? From my readings, the roots go back to the Middle Ages, when the Popes at the Vatican needed money, and they spread the word that, in the name of God, they can forgive the sins of the people for certain fees, of course. I totally believe that; a murderer confesses to a priest and then the bad guy has a nice life on Earth and afterlife the God will welcome him with opened arms.