Fourth, the need for reparation and restitution in the priestly legislation showed that sin had an impact on others and demanded that a person change his or her behavior practically in light of the grace that was afforded through the sacrificial rite.—A Severe Mercy, page 76 (emphasis his)
Sin always has a communal effect. I know it is hard for us in our individualistic society to fathom that, but it's true. What happens in the darkness of a corner room has a society-wide ramification. Of course, the answer isn't more legislation, but instead repentance and reformed behavior by the power of the Holy Spirit.