BBC: Timbuktu mayor: Mali rebels torched library of historic manuscripts
Not only are the people of Mali being attacked, but so is a library that proves that science and math where being found and developed in the Middle Ages, in South Africa. It ought to be a World Heritage Site, why would the Muslim attackers want to destroy the library?
For the same reason the Library at Alexandria was destroyed: The insistence by church leaders on the continuation of ignorance, plain and simple.
“At the solicitation of Theophilus, Bishop of Alexandria, the emperor issued an order at this time for the demolition of the heathen temples in that city; commanding also that it should be put in execution under the direction of Theophilus. Seizing this opportunity, Theophilus exerted himself to the utmost to expose the pagan mysteries to contempt. And to begin with, he caused the Mithreum to be cleaned out, and exhibited to public view the tokens of its bloody mysteries. Then he destroyed the Serapeum, and the bloody rites of the Mithreum he publicly caricatured; the Serapeum also he showed full of extravagant superstitions, and he had the phalli of Priapus carried through the midst of the forum. [...] Thus this disturbance having been terminated, the governor of Alexandria, and the commander-in-chief of the troops in Egypt, assisted Theophilus in demolishing the heathen temples.”
—Socrates; Roberts, Alexander; Donaldson, James (1885), “Socrates: Book V: Chapter 16”, in Philip Schaff et al., Nicene and Post-Nicene Fathers, II, II