Trophy hunting is a developmental stage that some adults never outgrow

Evidence

The trophy-hunter is the caveman reborn. Trophy-hunting is the prerogative of youth, racial or individual, and nothing to apologize for. … The disquieting thing in the modern picture is the trophy-hunter who never grows up, in whom the capacity for isolation, perception, and husbandry is undeveloped, or perhaps lost. — Aldo Leopold, A Sand County Almanac, 613