As in what may have happened in their past to look to help others, whatever they feel whether its duty or the will to help because of morals or because they can't stand to see others where they once laid?
Do people help because they're good or because they think they owe something to society?
Or because they feel guilty? Maybe they did something to someone in the same position before and they made it their wish to change their ways and help and try to put a mask on that experience.
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I help because if i dont odds are nobody will, that and i hate seeing others..even total strangers feel sad.