Why did Svetlana Alexievich write "Zinky Boys"?

In the beginning of Zinky Boys, Svetlana Alexievich states that she didn't want to write another war book and talks about how strongly and negatively writing her previous war book had affected her. That being said, I'm not sure if I missed something, but I was slightly confused as to why she did go ahead with writing this book after all. Can someone explain what I'm missing?