Duh. Miko's narrative purpose was to both show and tell us who it's okay to kill. Do you have any idea how grave of a sin it is to be a dragon whose scales aren't shiny? Everyone knows they're evil. They deserve to be exterminated, not because each one is a mass murderer; that's just a thing they do. They should be killed for what they ARE.
And please, Playgrounders, stop referring to the killing of goblins as genocide. Genocide is something that happens to PEOPLE.