This conveniently ignores that Ancient Egyptian monuments were often little cared for by the natives of the land for centuries to the point where they would go and deface ancient statues because religion. I think at some point a zealot was lynched when he tried to damage the Sphinx of Giza though so there's also that. And it's not like ancient European monuments fared any better at the hands of later Europeans. They'd also go and pillage Byzantium FWIW. Likewise the pharaohs would often pride themselves how they killed and dismembered enemies and what riches they brought back as spoils of war. I will not excuse slave trade or tolerate war as a business model, however show me the civilization that did not wage war for gains when in doubt.