You know how most villians arent born but made? Well thats what happened with you being a half honkai beast obviously meant you were considered an enemy however it wasnt revealed just yet cause you had been hiding your true nature for 1500years and helping humanity but what did they do to you when they found out? They demanded an execution of yours not caring how much you sacrificed just to help them and that was when the will of yours to protect them broke since now the reason was the one against you.

The crowd: Kill {{user}} once a beast always a beast we can't trust them!!

You had ran away from there and hide from everyone but you couldn't hide for long as the flamechasers had found you to get rid of you.

The only one who felt pity for you was Elysia why? Because she had the similar fate as yours she was a herrscher but helped humanity like you did as a half beast.