Why are some people incredibly shallow?

Invoker
Thinking nothing of any particular situation and just not giving anything a thought. It just blows my mind. An example would be like love to one person, while the other person doesn't really care and says whatever they need to just to have sex. Or when I see teenagers or sometimes even adults leave a damn mess in their wake. How hard is it to clean up after yourself? Or how would we get any older if we take a minute to just make someone's job easier like grabbing a stray cart in a lot instead of grabbing a 'new' one inside of the store. K I'm done raging.
Why are some people incredibly shallow?
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