Its the Muslim’s MO.
It’s everybody’s MO. In the 18th century, when English colonists from Georgia and South Carolina attacked Spanish Florida, they burned the Franciscan convent in St Augustine. Fearing that they hadn’t done enough damage, they actually went back and burned what was considered one of the most valuable libraries of its time in the territory that is now the US. The Franciscan library consisted of books on the sciences, languages, music, theology and philosophy, as well as maps and of course the documents relating to the records of the Franciscan missions. It was a disastrous loss to later scholars, and certainly to the people of the time.
It’s a very spiteful, gratuitously ugly act but not restricted to Muslims, alas.