Probably because an attack on an underground nuclear facility in Iran (or anything else in Iran) is an act of war.
And once we commit an act of war against another country, that country's response is completely unpredictable; an act of war on their part is not only possible, but highly likely.
“Probably because an attack on an underground nuclear facility in Iran (or anything else in Iran) is an act of war.”
Really???
You mean all those assaults on our ships by Iranian forces in international waters were not acts of war?
Iran is over there, and if Americans don’t show up over there, there is no war.
And do you actually think Iran will go to war with the United States when it can’t even fight little Israel?