Superman and the Justice League come back after a decade of absenteeism. They are apparently pissed off that a whole new generation of fans have turned to Image comics and their Splash Panel/Endless Orgy of Violence in their absence. So, in accordance with the early-to-mid 1990s comics mentality, they respond with orgies of violence of their own. Just to teach those Crazy Kids how its done. 

The guy at the back is The Ray. Why is he on the Justice League Roster is a complete mystery to me, as he was published by a different company. Ah, outsourcing....