It's laziness, people are so lazy these days. And they are interested in nothing more than their own amusement and well-being. It's a wonder they even bother to tell you the reason why they didn't show up. But that too will disappear, they won't let you know at all why they didn't show up.
Laziness is a side effect of dopamine desensitization. Facebook, porn, junk food, cigarettes, etc all fuck with your motivation subsystem, that's why people are motivated to repeat the behavior.
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