What better franchise than Planet of the Apes to illustrate the consequences of such pride?
Everything that goes wrong in this world is due to human pride. Experimentation on the apes make the intelligent. A virus they create reduce the human race to a small population of infected mutes. Even worse, the few who avoid infection become unreasonable savages. Human pride ends the human race.
War for the Planet of the Apes is the thrilling conclusion to this franchise where the final battle between humans and apes ensue, and the ruling race is crowned. It is not a battle over land. It is not a battle over rights. It isn't even a battle over a title. Instead, the film depicts a battle over something far more precious.
HUMANITY.
There is a clear contrast between the apes and the remainder of the human race in regard to these standards. The apes continue to evolve not only as intelligent, but also as compassionate. The humans on the other hand devolve. Though the virus strip them of their intelligence, the war strips them of their humanity.
Ceasar in particular faces a test in humanity when his family is murdered. He could accept his responsilities and protect his tribe as they relocate to a safe place. Instead, he abandons his responsibilities, his tribe, and his surviving baby to seek revenge. In doing so, he learns a valuable lesson in humanity. As a result of his breach in judgement, his tribe suffers. Only when he lets go of revenge and protects his tribe do they have hope of survival.
He learns revenge is unnecessary. All he must do is focus on protecting his tribe and wait. It is only a matter of time before the human race wipes out itself. Thus, the world of the Planet of the Apes begins. Not due to any fault of the apes. The human race is completely responsible for its own destruction.