Answer:
Because the burning of books is a great symbol of racism and religious intolerance.
Step-by-step explanation:
When Muslim books are burned there is a strong sense of Islam. This burning represents a limitation of information about Islam and a ban on the dissemination of its concepts. The books explain what Islamism really is and burning them prevents people from knowing and being exposed to only racist, prejudiced and strongly religious intolerance concepts and this is what makes the whole process more painful for Layla.