It might be useful to reflect on the origin of the idea of a sin offering and justice.

We didn't make up the idea of justice, of offering, or of redemption.  

It was nascent and imperfect.

God implanted it in us. Jesus perfected it.  

In the same way with love or even with ideas such as "the good".  We had an idea of love before Jesus came into the world.  We were attracted to it...because it came from God! 

But Jesus perfected it, and He showed us how to love. 

Jesus brought all these imperfect ideas of justice, redemption, mercy, and love into the highest perfection and completed unity on the Cross and in the Resurrection.

If we don't love (as He loved and died) we will die, and we won't be resurrected with Him.