It is not exactly a threat to "obliterate Iran." But it is quite troubling. She offers massive retaliation, BY THE UNITED STATES not only in the case of Iran attacking Israel. But also an umbrella of retaliation covering a host of other unspecified countries in the event of an "unprovoked" nuclear attack by Iran. This seems to me to be unwise on several levels. For one who refuses to talk about hypotheticals for something as trivial as today's Pennsylvania primary. It looks like a hypothetical offer of alliances she would not be authorized to make without congress, even if she were President. On the other hand she seems to be trying her own hands and hypothetically tying here own hypothetical hands way too prematurely.
This woman is not fit to be President. I am concerned that she will kill thousands, just to show she has balls.
Teddy Roosevelt said "Speak softly and carry a big stick." Not "Bark like a puppy and the world might fear you."