Why not? When the world is ending you take what joy you can, while you can.

When all you have left is having been right, there's not much else to keep you busy.

I don't know if it is gloating so much as it is recognition that unlike most injustice that happens in the world the people most responsible for it are going to suffer at least some of the consequences along with the hoi polloi.

A refreshing change of pace, even if the end result is horribly tragic for everyone.