Blood Meridian or the Evening in the West

I think an important theme in the book is man's affinity for Violence Critic Harold Bloom claims that Blood Meridian is not about violence - it is violence. Bloom's assessment is partially based on the matter-of-fact way in which McCarthy describes the atrocities committed by Glanton's gang, the Apaches, and the Mexicans; violence is simply a way of life in this world. For most of the characters in the novel, violence is essential for their survival, but many others engage in violent behavior for its own sake. Certainly, McCarthy's depiction of senseless bloodshed is inherent to his exploration of this particular historical context. However, by eschewing psychological and sociological explanations for his characters' brutal actions, he suggests that man's affinity for violence is larger than that time period and is, in fact, a universal vice. You can check out other themes below:

https://www.gradesaver.com/blood-meridian-or-the-evening-redness-in-the-west/study-guide/themes