The word that comes to mind when recognizing Michael's humanitarian work is humility. Michael understood the 4 cardinal virtues well (no doubt from his upbringing); Prudence, Justice, Temperance or Restraint (Humility being a part of this) & Courage or Fortitude.
Faith, hope and charity were a driving force in this man's life, his modesty came from that inner humility, he used his supernova fame as the conductor for his philanthropy.
If I remember Live Aid was a continuation of Band Aid and the song from '84 "Do They Know It's Christmas", simultaneously held in the UK and in the US @ RFK Stadium in Philly, PA. There were a lot of no-shows who were scheduled to perform, so MJ not being there doesn't mean anything, other than he was somewhere else at that time. Bob Geldolf through Live Aid brought attention to a global injustice that to this day has not been eradicated, there is no race to being #1, there are no points earned, there are only human lives saved because of all these efforts. If someone can use their celebrity to illuminate an injustice, let them do it however they see fit. I applaud Bono's efforts, no one has the fame that Michael has so everyone else has to be a bit louder with their rooftop scream to get noticed.
Michael's work in Africa includes financially supporting programs to build and equip hospitals, orphanages, homes and schools. He has also financially supported programs relating to Child immunization, HIV-AIDS, Education and Apartheid, the recipients of this man's help know of his goodness and in the end, that is the true measurement of his virtue.