God did not make the injustice, and gave the righteousness to show that the injustice never existed and does not exists.
God did not created the sin, and gave the Forgiveness to show that there is no sin.
The same with: dream and waking up; illness and healing; darkness and light.
Forgiveness is a sponge that erases the time (with everything that seemed to be in that time).
When injustice and the Righteousness (or ignorance and knowledge) meet, they cancel each other (as two opposed illusions, minus and plus) and the Truth appears, which did not ever missed, but its light was slightly overshadowed by a small cloud of the mind.
When illness and healing come together, they disappear and and will appear what never missed: the Health.
When sin and forgiveness come together (darkness and light), they disappear and will be revealed what is always eternally and it never missed: the Holiness (the Truth / the Consciousness / Peace).