Iran threatens to shut off Strait of Hormuz if west imposes sanctions for nuclear program

Good way to get yourself blown up.  I'm just not convinced the world can live with a nuclear Iran.  Israel certainly can't.  And my confidence level is low that Iran wouldn't some day think it wise to proliferate its nukes to other countries, and to other terrorists. It seems as if we're biding our time, hoping to knock off enough of their scientists to postpone their first nuke in the hopes that there's a friendly revolution first.