You omit the fact that he has made a conditional statement. If Iran has to face nuclear blackmail from Israel it necessarily wants its own weapons to ensure mutual assured destruction and protect itself. If you are living under the threat of nuclear blackmail the need for self protection demands that you be able to counter the threat.
Yemen's Houthi rebels commit to peace plan in letter to UN chief, BBC reports (Haaretz)
from the article: Iran: World can't block our atomic program while Israel has nukes