Girl

Girl -> gurl -> grul -> grue! Aha! But you don't fool me. Never, never, never! For the carrots within the burning cookie accumulator protect me from harm and evil. Yes, yes indeed!!1!

Must never turn off the lights!

A different perspective

You know, evil and such is a perspective. That goes for grues as well! If you just view them that way, surely their eating of you is but a sign of love and benevolence. Don't run, and don't turn on the lights; they lurk with good intentions.