Iran's president is a terrorist, Iran's Ayeitolieybowl is a terrorist, Iran's Mullahs are terrorists. Iran funds, trains, and arms, a terrorist group called Hezballah.
As such, I would say that Iran's involvment in nuclear technology (except for energy where enrichment takes place outside of Iran) is unacceptable.
Iran is the world foremost state sponsor of terrorism.
If Iran got nukes there would be no peace in the world.