Every statue in the plaza represented an Ancient of the jungle that was drawn to Gehenna at the end of its life.
They had participated in wars and slaughter all their lives, only to realize how pointless their struggles against each other were.
Their true enemy was elsewhere, but by the time they figured out that person's identity, they'd already destroyed themselves.
Gehenna was a cemetery for spirits. For some it was heaven, for some it was hell, and for others it was purgatory.
These ancient spirits experienced something in between.
They had to relive their tragedy over and over again for eons. It started before they entered Gehenna, and when they came here, the realm imitated that reality.
It was punishment for their sins.
However, as Damien finally arrived and participated in the demonstration, finally granting purpose to their endless battle, their punishment ended.