No, we are very much involved in fighting a cold war with Iran at the moment, from the use of technological weapons like hacking and so on, to the fighting of proxy wars such as Iraqi insurgency groups. Have no doubts that we have covert operations in Iran now acting against their nuclear sites.
I wouldn't take everything that's happening in Iran at face value, some low level scientists being killed by cude methods? I'd say it's Iran doing it themselves, they get to bang the 'West is Evil' drum but not kill the important individuals that matter to furthering their Nuclear infrastructure.