There are many who know it. Then there are few, who for various nefarious reasons deny it. They claim there is no incontrovertible proof that it is.
However, the sane world’s response, in the form of sanctions to force the Islamist warmongers to cry uncle and heed the many UNSC resolutions demanding it stops the full cycle illegal nuclear program has reached a plateau.
Either sanctions have to be kicked up many notches all at once, or birth of another rouge nuclear state the like of N. Korea, and in the most strategic place on earth, is a forgone conclusion.
To avoid the devastation of war, and/or the game changing terror of nuclearization of many undemocratic states in the Persian Gulf and beyond, all non-military pressures with the aim of regime change have to be piled on.
The gulf between peace and war is narrowing fast. Airtight sanctions including air/naval cargo inspection has to be implemented.
Nuclear weapon in the hands of the warmongering Messianic Islamists is bad news not just for the enslaved Iranians and Syrians; it is bad news for mankind.