What are some reasons for Hemingway's interest in violence?

What might appear to be violence to many seems to be
adventure to Ernest Hemingway. For example, Hemingway grew up traveling to Michigan to
hunt; he enjoyed the adventure aspect of those hunting trips and was inspired to be
involved in big game hunting as an adult. While these activities might seem to be a lust
for violence to some observers, for Hemingway, hunting was a way of life and an activity
that brought back fond memories of time with his
father.

Admittedly, Hemingway's experience and injury in
World War I disillusioned him and contributed to many of the themes of his "Lost
Generation" works which often focus on external conflicts between humans and between
nature and humans, but Hemingway's writings do not paint him as one who was simply
interested in violence. Rather, he sought to portray accurately what witnessing violence
does to humans. Hemingway purportedly wrote that

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"all things truly wicked start from
innocence,"

and so his
perceived focus on violence--in most of his works--illuminates a character's loss of
innocence.