[There's a part of him that vaguely understands, because his immediate thought is then what the fuck's the point?

Which is...the point.

Either he's dead and it won't matter anyway, or he gets revenge on the gods who literally won't be able to fuck over anyone else with the Crystal. What does he have to lose?]

Yourself.

Ardyn. There's enough of Lucis Caelum in there that it's bullshit to say you're just the Starscourge and nothing more. You are not just Izunia. Your feelings are there. They're just muted. You aren't gone.

And if you do this, there really won't be anything of you left.