In other words, Yamata no Orochi was a powerful foreign enemy of ancient Japan, and it can be said to have been invented by the Yamato race, who tried to prove the appropriateness of their behavior, hiding the fact that they offered a person as a hostage to him and gave their fealty to the country, exaggerating how bad the monster was.
つまり、ヤマタノオロチというのは古代日本にとってかつては強大な外敵であり、彼に人質を差し出して臣下の礼を取っていたという事実を隠し、如何に悪い魔物であったかを誇張するかのようにして、自らの正当性を保とうとした大和民族の工夫といえる。