There is a wide range of philosophical views on humans' obligations or motivations to act altruistically.
ðɛɹ ɪz ɐ wˈaɪd ɹˈeɪndʒ ʌv fˌɪləsˈɑːfɪkəl vjˈuːz ˌɔn hjˈuːmənz ˌɑːblɪɡˈeɪʃənz ɔːɹ mˌoʊɾɪvˈeɪʃənz tʊ ˈækt ˌɔːltɹuːˈɪstɪkli.