What Happened to Madeleine McCann? Theories
The Disappearance of Madeleine McCann: 5 Theories About What Really Happened
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As noted previously, the area around the resort of Praia da Luz was home to an unusually large number of predators. One of the simpler theories about Madeleine's disappearance is simply that she was the victim of a random crime: unattended children frequently seen in an area, plus a high concentration of predators, and she just happened to be the one grabbed, perhaps because her bed was reportedly closest to the door.
At least one Reddit thread brings up this theory: "An opportunist snatched her, and was well out of the area before any proper investigation started to take place . . . It could've been either kid, her sister just got lucky. Only one was taken, so it's going to be one kidnapper and likely unplanned beyond having seen Madeleine during their holiday."