Islamic jihadists want to destroy the artifacts of non-Muslim civilizations because doing so testifies to the truth of Islam, as the Qur’an suggests that the destroyed remnants of ancient non-Muslim civilizations are a sign of Allah’s punishment of those who rejected his truth:
Many were the Ways of Life that have passed away before you: travel through the earth, and see what was the end of those who rejected Truth. (Qur’an 3:137)
This is one of the foundations of the Islamic idea that pre-Islamic civilizations, and non-Islamic civilizations, are all jahiliyya — the society of unbelievers, which is worthless.
“Explosive device neutralized near Tomb of the Patriarchs,” Jerusalem Post, June 10, 2018:
An explosive device found near the Tomb of the Patriarchs near Hebron in the West Bank was neutralized by bomb dispersal experts on Sunday, Border Police stated Sunday evening.
The explosive consisted two small gas canisters, among other things….