>>280181292
Putting aside the fact that he has no right to decide who should and shouldn't go to hell, the three kids this chapter didn't deserve to get keyed. They were troublemakers but not to the level of the previous guys or the kind that won't change their ways when growing up. This chapter made it obvious that he's gung-ho about using the key, despite the mark it leaves. Think of it as a drug addict at the start of his addiction. A small dose will stop being a small dose in a short time.
Raika understands that using the key ain't right. And he has barely any context to how it came to be.