you are confusing campaign rhetoric with actual actions.  in all campaigns candidates take positions and make statements; oftentimes they are made to distinguish themselves from other candidates.  with regard to Hillary's statements about a no-fly zone, I am sure she will evaluate it again when she becomes president with advice from the generals and other defense leaders.  so to conclude that her statement is irreversible is being naïve.  the president does not make decisions unilaterally, decisions are based on input from affected and qualified cabinet members and other specialists in the administration.