David Frum : In face of Rouhani 's moves , U.S. should smile back , keep up security . He says there 's reason for skepticism ; Iran has history in terrorism - oriented politics . He says Iran holds the real power ; still , there 's hope some change may begin . Iran : Iran has long record of deceit ; for progress , nuke program must be shut down .
David Frum : In face of Rouhani 's moves , U.S. should smile back , keep up sanctions . He says there 's reason for skepticism ; Rouhani has history in terrorism-backing regime . He says Khameini holds the real power ; still , there 's hope some change may begin . Frum : Iran has long record of deceit ; for progress , nuke program must be shut down .