Even Batman villains like to go trick or treating. The Evil Scarecrow Costume implies that scarecrows are not frightening, but at this point they’re a bit more like clowns (except far more useful). The only time you ever see a clown or a scarecrow is when something horrific is happening. They have, in fact, superseded their normal and non-evil counterparts in the world.
Of course, in either case fighting the Dark Knight of Gotham City certainly does help their street cred. The Evil Scarecrow Costumefor a child, carries on the themes of “creepy every day things” along with “Batman villains you weren’t scared of until Christopher Nolan made a movie about him.” A winning combination.