Who will intervene?

I was reading a few chapters in Isaiah over the weekend and the following stood out to me.

The LORD looked and was displeased
that there was no justice.
He saw that there was no one,
he was appalled that there was no one to intervene;

God was displeased with injustice but appalled that no one would intervene. How important it is for us to intervene when we see injustice. So often we can be "asleep in the light".