What causes a person to laugh at death?

It’s this teacher recently arrested her for murder and other charges including sex trafficking. I’m looking at some of her social media posts and it disgust me. When kids die or elderly people die, she seems happy about while pretending to empathize with the family. She even lied on her application to get the teachers position. She was teaching 3rd grade. It sickens me when she crave the attention from deceased people for likes and comments. She thinks kids and their parents dying funny
What causes a person to laugh at death?
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