This is such a laughably typical strawman excuse that is used to shut down all discussion on this topic.
It is indeed possible that if the NSA used a very different strategy with vulnerabilities, Iran might be further along with its nuclear weapons development.
Or rather, will always be possible until we move to doing protocol and behavior analysis of SCADA commands (as they enter the machine). And that'll just mean it has to get more subtle. If there's a way to do it right, there're more ways to do it wrong.
You're the one trying to shut down discussion.