I Am My Monster

When it seems like nothing they can do can help Steven, who has corrupted himself into a giant monster, everyone (The Crystal Gems, Greg, Spinel, and the Diamonds) begins sobbing uncontrollably over how this is all their fault for not noticing the pain Steven was in or how much they hurt him in the past or hurt someone else that eventually hurt him now... until Connie shakes them all out of their self-pity and rallies them into bringing Steven back to normal.

Example of:
It's All My Fault