Suzanne Collins said this quote

“ The beauty of this idea is that my decision to keep Peeta alive at the expense of my own life is itself an act of defiance. A refusal to play the Hunger Games by the Capitol's rules. My private agenda dovetails completely with my public one. And if I really could save Peeta... in terms of a revolution, this would be ideal. Because I will be more valuable dead. They can turn me into some kind of martyr for the cause and paint my face on banners, and it will do more to rally people than anything I could do if I was living. But Peeta would be more valuable alive, and tragic, because he will be able to turn his pain into words that will transform people. ”