Although it’s not widely appreciated, the nuclear deal Washington is currently dangling before Iran to entice it to halt its declared uranium-enrichment program is a cure nearly as awful as the disease. To be sure, Iran’s enrichment effort, if unchecked, could bring Tehran within days of acquiring a bomb. But Washington’s latest overture to Tehran—offering advanced large nuclear reactors, hundreds of tons of lightly enriched uranium, and a pass on Iran’s violation of the Nuclear Nonproliferation Treaty—will only make it tougher to toe a hard line against Iran later this fall. And it could literally blow up in our faces...