Enriching uranium is the hard part of building a nuke (esp once you've already been building 1000s of ICBMs like Iran has). The fact that there is no actual "nuclear weapons program" is just tactics on the part of Iran, so that they can say "we don't have one". But there is no other reason to enrich uranium to 60% (IAEA reported number). Energy production requires < 10%. Weapons require ~90%.