The reconciliation is twofold. On the one hand, sinners are hostile to God and in need of being reconciled to Him. Hence, the emphasis of Scripture is on our being reconciled to Him. Nevertheless, this is the result of His turning in favor to us. By substituting himself for us, Jesus actually bore the punishment due us, appeased the Father, and effected a reconciliation between God and humankind.
Moral goodness is necessary for a person to be worthy of happiness.
Conversely, the evil person deserves unhappiness. He who would undo the linkage would himself incur guilt by destroying the moral fiber of the universe. The substitution of someone else to bear our penalty seems unfair. It is as if a judge, upon finding a defendant guilty, sentenced someone else to suffer for his misdeed. Such a substitution would not be unfair, however, if the innocent party volunteered to take the punishment.