No one is permitted to make nuclear weapons. Not being an NPT member does not mean certain attack. Look at Israel, North Korea, India, and Pakistan; no one attacks their nuke sites. No war is ever justified. People create wars to satisfy their own agenda.
UN: Gaza could be 'uninhabitable' by 2020 if trends continue (AP)
from the article: U.S. doesn't foresee nuclear deal with Iran in near future