Just.

The Justice League is a group of heroes with super abilities. They fight countless battles as the Justice League and leave mountains of destruction in their wake. Part of that destruction is the loss of valuable and irreplaceable human life. Somewhere along the way in one of those battles the lives of our main character's parents were taken. The main character grows up and vows to destroy the League for the destruction of so many families lives. That is then where we come in and take a wild ride with Prometheus to take down the members of the Justice League.