Think about it for a moment, how everybody that Katniss loved ended up destroyed in the end. The irony in the fact she spent her life trying to protect everyone, but only resulted in making them perish in one way or another.
* Spoilers
People Katniss Cared About
  •  Prim (Died)
  • Mother (There relationship fell apart, and she moved away to District 4)
  • Gale (There relationship was broken, and Gale left to District 2. He was heavy with the burden of guilt, heartbreak, and the pain and scars of the war)
  • Peeta (hijacked)
  • Finnick (Died)