If you are the first to kill your rivals’ relatives, including their pregnant women, you get a brief competitive advantage: people are more scared of your cartel and they will cede more of the drug market to you. Then every cartel does it: it becomes part of standard practice. If you are the first to behead people, you get a brief competitive advantage. Then every cartel does it. If you are the first to behead people on camera and post it on YouTube, you get a brief competitive advantage. Then every cartel does it. If you are the first to mount people’s heads on pikes and display them in
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