I think there are two primary reasons for the difference in treatment of these two killings
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The killing of the CEO was meant to be a message to the country. It’s a different scale. Because something like this is such a spectacle, it gets national attention and the local and federal authorities are forced to deal with it quickly- otherwise they lose face.
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Ultimately the power structure cannot tolerate these types of rebellions. It’s like a slave talking back to the master. You allow it once and you open the door for it to happen again. You have to try and shut it down as quickly as possible.