Se7en (1995)

David Mills brings hot-headed hubris and moral arrogance to a bleak metropolis, stubbornly convinced he can bring a meticulous serial murderer to heel through brute determination. Somerset repeatedly warns that their quarry dictates the tempo, but Mills barrels forward until he stands in a desolate desert opening a cardboard delivery. By pulling the trigger in blind fury, the young detective executes the killer's masterwork, sacrificing his soul and handing John Doe a total philosophical triumph.