It's really one of the most memorable scenes in modern FF, IMO. Even the Lucavi in FFT wish they were as evil as this.
Except its not ?
It reinforces how these characters were little more than fodder meant to die with little to no actual characterization.
Its a cheap attempt at emotional manipulation,Ardyn didn't even earn this moment.He's not even nearly as bad as the moment lets on.Just because he tells he's a baddie doesn't make him one.