His "comrades" were endangering his life countless times. Silvia herself once stopped him from killing a dragon because it was an endangered species. Guess what? It burned villages down and many people lost their lives. The Soldier put in charge of training constantly assaulted him day and night because he was 200 levels higher than him. This lead to him needing healing magic, which in this world takes away exp. and levels. Just so the "teacher" could keep beating him. The rest are not better. Oh and don´t cry for the Elves. They are warmongering racial supremacists. Fun fact, our MC meets their ancestor, who loved humans above all. After hearing about their actions he wants to wipe out all of them, for attacking humanity. The only one who was not a KKK-alike racist was Silvia´s brother who usurped the throne. Of course, Silvia manipulated the hero, which lead to civil war. Another princess used the MC as a puppet to take the crown in her country.
That´s basically it, except... oh yeah, the kingdoms own nobles are demon worshippers.