How is Tom Robinson innocent (not just in the trial) in the book "To Kill A Mockingbird?"By innocent I mean like "the liitle girl looked so innocent."

"Tom Robinson is a mild-mannered, conscientious black man whose kind acts earn him only trouble when Mayella Ewell accuses him of rape."  He is an "innocent" because he trusted Mayella, he even says he "felt sorry for her."  Tom never dreamed that helping this young white girl could get him into so much trouble.  Tom also demonstrates innocence when he trusts the judicial system to do what was right.  Tom never hurt anyone and looked at the world through the eyes of a trusting caring man.