Why does the man shoot the cannibal in the book the road?

In Cormac McCarthy's "The Road," the man shoots the cannibal to protect his son and assert control over a dangerous and hostile environment. The cannibal poses a threat, as he represents the brutality and moral degradation of a post-apocalyptic world where survival often comes at the cost of humanity. By eliminating this threat, the man seeks to create a safer space for his son, underscoring the father's instinct to safeguard his child's future, even in dire circumstances.