Because (A) the artist asked for monsters, and (B) a lot of kids draw with far more disturbing intent than many adults will acknowledge. Look at a lot of those

Because (A) the artist asked for monsters, and (B) a lot of kids draw with far more disturbing intent than many adults will acknowledge. Look at a lot of those original drawings and tell us they're NOT supposed to be disturbing ("chomping baseball" and "crucifiction" for starters).