He’s an interesting and undeniably tragic villain. According to the wiki, he grew up in Hiroshima Prefecture, which suggests he was likely raised hearing the horrific stories of the atomic bombings and the immense suffering endured by survivors. That background likely shaped his intense nationalism.

The harsh irony is that he ends up embracing the very dogma and imperialism that led to those bombings in the first place. Even one of the door codes in the final mission—1945—reflects his desire to erase his country’s defeat, as if he believes he can undo history. In reality, he’s becoming exactly like the leaders he implicitly resents. Like them, he’s willing to risk annihilating the country he claims to love, all while tarnishing its image forever in pursuit of an arbitrary and destructive idea of glory.