I have read this twice before and completely forgot he was an reincanator. It's completely uninportant to the story and not even mentioned again in future chapters.
With the power of hindsight I can confidently say that preaching anti racism in school does not work. That has been done for decades now and race relations have only worsened.
Because the demons would clearly lose, only a single country from the human side is capable of holding the demons for generations. If that one nation received help from the others it would be the end for the demons.
Of course this bozo never bothered to learn how to fight even though being a representative for Anastasia was his plan all along. He deserve all the bad shit that is coming for him.