Mocking Jay

I have just finished reader Mocking Jay by Suzann Collins. I haft to say it was a great book but still not the best. I still feel that the first was the best by far. In this book I feel that there were a few things that were left unsolved. One of Them is at the very ending of the book when Katniss was going to shoot President Snow. I'm am still trying to figured out why Katniss shot president Coin when she was suppose to shoot Snow. When I first read over Katniss shooting President Coin I was thought I had miss read it, because then it says that Snow begins to laugh when I thought that she had shot him. So I kept on reading over it really confused, so I read on to see if it will unfold. The story kind of touches on it but I am still confused about it. Another unsolved multistory is also towards then end, when the hovercrafts drop napalm bombs on all those kids and kill Prim. When Katniss goes to talk with Snow, he tells her that those bombs were not dropped by him, because if he had any hovercrafts left he would have flown off in them. But that still dose not make sense of why president coin would drop them.