He fucking said why earlier. It's more fun to break someone then kill him. Plus if you paid attention in the episode, Carl saw a side of Negan that no one else has when he apologized for making fun of his eye socket. If anything this pretty much followed this sequence in the books exactly outside his wives being dressed sluttier in the comics. But then again we can't expose people to seeing girls dressed like they are working dollar night at the strip club.
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