whats the deal with ajira

If Flight 815 crashed due to Desmond not pushing the button then why did ajira 316 go down. and why did some people stay and some go back in time. Also, if Sayid was killing Widmores men, why is Ilana arresting him evan though she is Jacobs chick. I cant take it anymore its too effing long to be waiting to see the end.

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