It was only a matter of time before actions such as these became public. The covert war has been going on for quite a while; I would expect more of these to come to light in the next few months, for good or ill.
The Iranian government wants nuclear weapons to put themselves in the position of having sufficient deterrent to attack that all middle eastern nations must use Iran as the crux of their foreign policy. If they accomplish this, anything that goes on in the region will have to accommodate them. Furthermore, it would seriously jeopardize Israel's existence, which would destabilize things even more; Iran is indeed serious about destroying Israel.
Iran is no innocent party, nor are they peaceful in their intentions. Don't mistake their feigned innocence for being a victim.
Most experts who don't have an agenda don't believe Iranian want the bomb or even want to create one. But they do want the ability of being able to create one on short notice.
The US Iran history goes a bit back. Do remember CIA hired bunch of street thugs In 1953 that led to overthrow of the democratic elected government.
Then in 80s when saddam hussain invaded Iran US provided Saddam ( yes that guy) with satellite intelligence and worst with chemical weapons to fight against iran. It's been estimated Iranian losses was around 1 million death in the war.
During that time saddam also got financial backing of Saudis and other rich Arab oil nations.
Prior to 9/11 Saudi-funded Taliban in afghanistan killed bunch of Iranian diplomats which almost lead to war. Iranians then backed the northen alliance which ended up tramendously helping US in overthrowing the Taliban and Al Qaeda. At that time Iranians even reached out to US to provide additional support but the bush administration turned them down.
The cynic wonders if this is the office workers geting more ordianry viruses and blaming the great satan to save face - migt be a bit hard explaining to the vice police how you got a virus from browsing porn sites.
"But Hounoured Mulla - I have no idea how those decadent pictures of those shameless hussys Palin and Widecombe appeared on my PC"
Computers were born of a cold war, and thus spawned a new one.
You could blame the machine or, the ones sitting behind the keyboards.