He who allows the Alien to live shares in its crime of existence
“Do not ask, ‘Why kill the alien?’ rather ask, ‘Why not?’”
You may tell me the other side is just like us, for me, they are just the enemy, and you kill your enemy, and if you can you kill their bloodline too. erase all record from their existents, genocide is a good thing.
maybe take their daughters and make them drink from the skulls of their fathers and brothers.