Cain didn't thing he was a saint. However, there were people he couldn't allow to live in no circumstances. People who had willingly abandoned their morals and humanity by commiting depraved acts.
These people were no longer human, no different from the insane Mutant Creatures. Although there was a line that could be drawn, he didn't had time for that. Besides, even if he drew a line, someone like Ghea Martins' would still be standing on the far side of it.
Cain's face was the epitome of calm and indifference. He was finally returning to the {Draconic Blast Furnace} after a full day of attending to his responsibilities.
Planning with the other Squads leaders, taking the ten Beastmen, or Mutants, as they prefered to call themselves, to hunt for Mutant Beasts, and creating various weapons and items.
Now, he finally had time to himself. However, that time couldn't be used to rest. Instead, he was going to use it to sort a few things out.