Innocence has many different functions in Of Mice and Men. When we first realize Lennie has a mental disability, he can be described as having a childlike innocence. His attitude towards the world and others is tempered with a simplistic, juvenile, and often warm view. Innocence also functions as the opposite of guilt. Lennie, perhaps linked to the first notion of "childlike innocence," is presented as a sympathetic character in spite of his constant failings and murdering tendencies. Innocence is something of a godsend and an excuse for bad behavior. It seems to fit in with Steinbeck’s insistence that characters be treated without judgment.
Innocence is a farce in this book. Even Lennie is guilty of crimes and petty cruelty, and no one is above being awful to others.