That blueprint included a flaw. CIA has done this before in the coldwar. Iran would get blueprints otherwise.
Infiltration isn't the issue. Read the article. Edit: Nice edit, but I think you're missing the point ~ they realised that the plans included mistkes, therefore were able to work around it. Either way, what are you actually saying? That it's ok the US gave Iran the plans because they do it all the time anyway?
we also sent saddam biological weapons... nothing new. We're always mixed up in part of the cause of every single problem....