Radak: The Gemara asks that Divrei ha'Yamim I, 14:12 says that they burned it, and distinguishes between before and after Itai ha'Giti came. He was a Pelishti; when he saw the fall of the Pelishtim, he came to David. Before he came, they burned it, for idolatry is Asur b'Hana'ah. After he came, he was Mevatel it, and they carried what was not yet burned; now it was permitted. Malbim - only a Nochri can nullify idolatry. Here they are called Atzabeihem, after Bitul. In Divrei ha'Yamim they are called Eloheihem, before Bitul. (Here, Radak holds like Avodah Zarah 44a, that Itai ha'Giti was a Nochri. Below (12:30), he rejects this! It seems that Radak holds that he converted in between. - PF)