When a jihadist attacked the Louvre Museum in Paris he intended to do more than kill people. He carried paint bombs. His intent was to destroy the finest art of Western civilization.
Why art? Art that involves animals or humans is forbidden in the Sharia. Art is the work of Kafirs and is part of jahiliyya (civilization of ignorance).
Islam annihilates a civilization piece by piece and leaves nothing of its native roots. Civilizational jihad destroys the very cultural history of every nation it comes into contact with.
We see the jihadist annihilation of museums and ancient architecture for the same reason. This civilizational war has been this way for 1400 years.