A dream about kidnapping often has to do with a fear of being forced to do something against your will or from being prevented from doing something that you want to do.
This fear can come from an inability to balance conflicting parts of your personality. One aspect of your personality has too much control over your actions.
Dreaming about being kidnapped can mean that you feel that someone or something else has too much control over you. An external force is preventing you from doing something that you want to do or from achieving a goal that you want to achieve.
If you dream that you kidnap someone else, you may desire more control over others. Alternatively, your dreaming mind could be warning you that you already have too much control or influence over another person. You need to give them more freedom.