This is said to have occurred because the government was afraid that the social influence of Usa Hachiman-gu Shrine, which was said to be a shrine that originally worshipped a local god of Kyushu region, grew so much that it would become a threat to the religious order centered on the Imperial family, Imperial household religious rites formed by the Ritsuryo system and the nation protection thought, and Buddhism.
これは本来は九州地方固有の神を祀った神社であったとも言われている宇佐八幡宮の社会的影響力の増大が、皇室と律令制・鎮護国家が形成する皇室祭祀と仏教を基軸とする宗教的秩序に対する脅威になる事を危惧したからだと言われている。