Injustice is our responsibility no matter which way you spin it.
I'll never forget a revelation that someone shared with me. They were telling how they were in another part of the world beholding some terrible injustice and the person just asked God, "God when are You going to do something about this?!" And God just spoke to them and said, "I already have...I gave them you."
If you look at all the Scriptures referring to justice, you will see that God has placed the responsibility of justice, not on Himself, but on us. We are the ones commanded to help the poor and needy, defend the cause of the widow and orphan, to feed the hungry, clothe the naked, shelter the sojourner...it's on us. One day He will come and He will make everything right; but until that day comes, it's our responsibility to make things right.