I’m glad you asked that. It’s incredibly important because it’s part of our aqeeda [theology]. Serving humanity is to indirectly serve The Lord of The Universe (i.e. Allah, as we call him). I don’t know much about the Taliban, but from what I do know, their aqeeda is based on fear. When your religion is based on fear, it’s got nothing to do with God. I would be surprised if even a few people among the Taliban are true muslims. They show a poor understanding of what the khilafah is, not to mention how they treat women.
When it comes to doing good, it is not a matter of interpretation or sectarian differences. It’s a vital part of Islam. There are too many scriptures from the Qur’an to list, quite frankly, but I will quote a few for you.
“It is not righteousness that ye turn your faces Towards east or West; but it is righteousness to believe in Allah and the Last Day, and the Angels, and the Book, and the Messengers; to spend of your substance, out of love for Him, for your kin, for orphans, for the needy, for the wayfarer, for those who ask, and for the ransom of slaves; to be steadfast in prayer, and practice regular charity; to fulfil the contracts which ye have made; and to be firm and patient, in pain (or suffering) and adversity, and throughout all periods of panic. Such are the people of truth, the Allah-fearing” [surah 2:177]
“On those who believe and work deeds of righteousness, will (Allah) Most Gracious bestow love” [surah 19:96]. In essence, this is saying that the evidence of a muslim is that he/she shows love; love towards Allah and towards everything else. That love produces sobriety of mind and patience and is absent of arrogance or wanting to be seen of men.
“Serve Allah, and join not any partners with Him; and do good to parents, kinsfolk, orphans, those in need, neighbours who are near, neighbours who are strangers, the companion by your side, the wayfarer (ye meet), and what your right hands possess: For Allah loveth not the arrogant, the vainglorious” [surah 4:36]
“O ye who believe! stand out firmly for justice, as witnesses to Allah, even as against yourselves, or your parents, or your kin, and whether it be (against) rich or poor: for Allah can best protect both. Follow not the lusts (of your hearts), lest ye swerve, and if ye distort (justice) or decline to do justice, verily Allah is well-acquainted with all that ye do” [surah 4:135]