His neighbor had done the same. They told the police he'd kissed their 4-year-old son. That's a reason for a grudge (unless it was true ... but we don't really know)
According to the sentencing memo [0], he confessed to it (page 5, and included in the guilty plea on page 24). The 4 year old also said it happened (page 5). He also coached his child to give false testimony about it (page 26). I'd say we know it happened.
