| Errors | Missing | Unverified | Supported |
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| 1 | 2 | 0 | 8 |
Dennis kidnaps the girls to provide "sacred food" for The Beast, a 24th personality he believes is evolving within Kevin. He specifically targets Claire and Marcia because he views them as "untouched" (privileged and without suffering), which makes them impure and suitable for sacrifice. Casey Cooke is kidnapped incidentally because she is in the car with the others, but she is ultimately spared when The Beast discovers her scars, revealing she is "broken" (has suffered abuse) and therefore "pure" and "evolved" like him. Dennis carries out this plan after he and Patricia seize control of Kevin's body from the benevolent personalities (like Barry) who had previously suppressed them.
In the movie Split, Dennis (one of the dominant personalities within Kevin Wendell Crumb) kidnaps the three girls—Claire, Marcia, and Casey—for a specific ritualistic purpose: to serve as "sacred food" for the arrival of the 24th personality, known as "The Beast."
Here are the specific details regarding his motivations:
Dennis, along with the personalities Patricia and Hedwig (collectively known as "The Horde"), believes in the imminent emergence of a superhuman identity called The Beast. They believe The Beast is the evolved form of Kevin, possessing animalistic traits, incredible strength, and thick skin. To facilitate his transition into the physical world, The Horde believes he requires a ritualistic sacrifice of "untouched" humans.
The central philosophy driving Dennis is the belief that people who have not suffered are "impure" and "inferior."
Dennis is chosen by the other members of The Horde to carry out the kidnapping because of his physical strength and his obsessive-compulsive nature, which allows him to keep the environment "pristine" for the ritual. He captures the girls in a parking lot and brings them to an underground maintenance wing of the Philadelphia Zoo (where Kevin works) to keep them contained until The Beast manifests.
The specific reason for the kidnapping is further clarified by how it ends. While Claire and Marcia are killed because they are "untouched," The Beast ultimately spares Casey. When The Beast sees the scars on Casey’s body (from years of abuse by her uncle), he realizes she is "broken." He shouts, "Rejoice! The broken are the more evolved!" and lets her live. This confirms that the motive for the kidnapping was specifically to purge those who had never known pain.
The summary implies Dennis targeted all three girls equally. In reality, he targeted Claire and Marcia; Casey was only kidnapped because she happened to be in the car with them.
The summary misses the crucial context that Dennis and Patricia were 'rogue' personalities who took over by force, not by consensus of the 'other members'.