If we were to "vaporize Iran" on Tuesday, oil would be selling for $300.00 a barrel on Wednesday.
DO NOTHING and that $300 barrel is going be astronomical not merely in financial terms but in quality of life which is astronomical, unquantifiable.
COST OF STOPPING HITLER IN 1934;A few thousand men, maybe, several ten of millions ($1930's)
COST OF STOPPING HITLER +1939:+55 million dead, many multitudes of billions. Has it been actually calculated??