And the opposite implication is to go to war, to prevent war.

Imagine being Iran for a moment. Iran requires nuclear power as they became a net-energy-importer about a decade ago. They signed onto an international treaty, only for a US President to unilaterally withdraw from said treaty.

So now Iran has 2 options: acquire nuclear weapons to deter foreign invasion & war, or attempt to acquire nuclear weapons for that act to cause a foreign invasion.

Iran is sure to be invaded by a foreign state should they not acquire nuclear weapons. North Korea and Ukraine are the best precedents

Nuclear weapons will proliferate as the plans have existed in publicly accessible locations for well over 50 years