It's wrong to sexually abuse someone.
Bruce is watching his niece for the evening while her parents are out of town.
Bruce wants to get sexual release.
Bruce waits for his niece to go to sleep and satisfies himself with porn.
Bruce uses his age and power to sexually abuse his niece.
Bruce feels more relaxed and is able to continue carrying on with his night.
Bruce's niece reports him, and he is sent to prison with a long sentence.