The best thing Radeka talked about was to use a grade five magic to annihilate a city. Of course the lethality of that magic was downgraded so as to not cause much damage to the huge population that lived underground.
But there were troops on the surface who would have been annihilated if not for Wilkis.
"Remember what I said before? I would kill you if there were civilian casualties in this mission?" Immortal threatened, his face twisting with his emotions. He didn't wish to cause the same carnage as before.
He was not in the mood for something like that. World was too chaotic to harm one another for simple things. Instead of fighting each other, to him it was better to destroy the plague and the necromorphs that roam these lands.
Obviously, not everyone thought like him. He was one of the idealists who can do anything for the betterment of humanity. But the people he worked with, even in UTENA, didn't share the same ideals as him.