Saudi Arabia does this with its own Islamic heritage all the time.
And at least parts of IS have vowed to destroy the Kaaba.
One must never forget, the pure doctrine of Islam is one of radical iconoclasts.
Beside the Saudis hate their own history. They love to be seen as modern, everything brand-new.
https://en.wikipedia.org/wiki/Destruction_of_early_Islamic_h...
https://time.com/3584585/saudi-arabia-bulldozes-over-its-her...
That part struck me, too. It's a narcissistic way of seeing things, where everything comes back to being about us (the West). ISIS's motives were pretty plainly spoken from what I understood at the time. It was a grand nihilistic reset they had in mind, where everything from before was to be erased, and a new, pure beginning was to happen.
Wrong! Islam was destroying old monuments long before modern West even existed. If anything West and ISIS fought on the same side, against Syria!