Eating human flesh is called cannibalism. It is something that most people find repulsive and is considered taboo in most cultures. However, there have been instances in history where certain groups of people have practised cannibalism, and there are a few reasons why someone might do it.
One reason is that they may have been forced to due to extreme hunger. For example, during a famine or shipwreck where food is scarce, some people may resort to eating the flesh of their deceased companions as a survival mechanism.
Another reason is cultural or religious practices. Some tribes or societies may believe that consuming the flesh of a defeated enemy will give them the strength and power of that enemy.
A psychological reason could be because of a specific mental illness or disorder. Some people with certain mental disorders such as sociopathy or Antisocial Personality Disorder may not feel empathy or moral qualms about hurting or killing other people, which could lead to cannibalism.
It's important to note that in most cases, the people who engage in cannibalism are in extreme and extraordinary circumstances where basic human needs are not met or are facing dire situations. And It's also important to remember that cannibalism is illegal and morally wrong in most countries.
In summary, while the idea of eating human flesh may seem strange or frightening to most of us, there are a few reasons why someone might resort to cannibalism. Hunger, cultural or religious practices, and certain mental disorders can all play a role.