Guts realizes that what Griffith has done to this world is evil instead of good, people aren’t meant to be control, just respected not from evil but in their culture. Not everyone is evil, just ignorant so we abuse it with technology. It’s basically greed and slavery with extra steps, we can’t keep exploiting people for our gain. It tears us apart. We need to be in harmony instead of abused. No one should be in control for fame and riches, everyone must be equal. He will control his anger for good not for evil.