Japan was an island country and with its stable state system with the emperor, betrayal or defection to neighboring countries, as well as overthrowing the government without an emperor, was unlikely.
また、陸続きの隣国が存在せず、また天皇を君主とした国家体制が続いてきたこともあり、隣国との通謀や亡命の可能性が低く、天皇を抜きとした政権転覆も考えにくかった。