Terrorists only have to 'win' once. Stopping them is an ongoing steady plod.
Being cynical is all well and fine. But would you have rather had certainty and had the plot suceed?
You can bet your boots that some terrorist wants to do this. I'm just very glad that someone takes the treat seriously and tries to do something about it.
And Iran wasn't 'improving its defences' it was enritching Uranium. I don't think that makes the world safer, regardless of who does it, do you?