Why? Are you saying people in general don't care about other people's happiness, or just that managers are special and don't care? I believe we care about people in close connection to us (family, friends, employees) but it becomes harder to truly relate the further away and larger the number of people are and it becomes more abstract (hence why it's hard to fix global health and poverty etc). I think there's even a psychological need to care about others once we've fed ourselves and achieved basic securities.