Whatever your view of the Iranian regime since the Shah, it's nonsense to say they've faced no threats since then. We backed Saddam in the Iraq v. Iran war.I think that's a bit selective to say the least. They have at least said that Israel won't exist in 25 years time, they've said that Israel is a cancerous tumor and they chant death to Israel. Iran faces no other threats except those created through its own actions so what else did they need a nuclear weapon for?
It's a bit obvious why they weren't allowed to acquire one whether they intended to literally use it on day one or not.
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Death to Israel - Wikipedia
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