Ronen Bergman:

Now, they have killed few Iranian scientists in Iran. And that had three different effects.

First, it took out people from inside the project that were experienced. Second, it instilled fear with the others. And, third, it made the Iranians to go to such an extent to prevent the next assassination or the next implementation of a virus, that that by itself delayed the project in years, without the Mossad even doing anything.

And to quote General Hayden, the former chief of the NSA and the CIA, when I asked him, General Hayden, what was the one thing that delayed the Iranian nuclear project more than anything, more than any of the other tools that were used, he said the one thing that caused them the most significant damage was that someone, I don't know who that was — it wasn't us — it's illegal according to American law.

But it was that someone was starting to kill their scientists, because what they were building in Natanz, the nuclear site, wasn't an atomic bomb. They were building knowledge. And knowledge, there's only one thing that you can do to destroy it.