Learned behavior. I myself am an example. My family (all biological) are all kind of scummy and rude and cocky. They care only for themselves, not even other family members. But I on the other hand care about everyone and everything. It all depends on the personality of that person. Don't forget if that person is stressed it alters the thought process, if someone just died the mourners may not "care" about anything anymore, but 4 weeks later they go back to caring.
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