This is grossly incorrect: Iran has been pursuing nuclear weapons and uranium enrichment for decades - and the west (and even the not-west) has been working to counter it the whole time.
Iran is considered a bellicose enemy in much of the middle east. A nuclear-armed Iran would quickly lead to the rest of the middle east pursing their own nuclear weapons programs to counter Iran.
A nuclear armed Iran leads to rapid nuclear proliferation throughout the middle east.
Iran is considered a bellicose enemy in much of the middle east. A nuclear-armed Iran would quickly lead to the rest of the middle east pursing their own nuclear weapons programs to counter Iran.
A nuclear armed Iran leads to rapid nuclear proliferation throughout the middle east.