It's not just national ideology, it's the murder of every man, woman, and child I care about. I'd have nothing left to live for but vengence.
Do you think there would be no innocents on the other side? Do you care so little for the human species that you would try to exterminate it? The war is over, it has been lost, but your rage and anger would justify killing possibly millions?
The bombings of the cities in Japan were justified by the fact that we wanted them to stop fighting - we didn't continue to attack once they surrendered, even if the desire for vengeance on our part probably made more than a few wish we would have.
No, my attack would be aimed at whoever had attacked us.
A weapon capable of destroying the sun would certainly fix their wagon.