Who'd you believe?

An independent investigation or the US government? Call me sceptical but it's fairly well known that the US would like regime change in Iran and havn't been above lying in the past to get what they want. They understand the logic that if one repeats a lie often enough people will often accept it, the US is quite good at shouting louder and longer than anyone else.

Iran may or may not be lying, they have a nuclear development programme, which they say is for civil use only. It does seem almost inconceivable that they wouldn't have a weapons programme as well given how keen the US is to invade middle eastern countries on the flimsiest of excuses. See Afghanistan and Iraq in last few years.

No WMD's in Iraq and no real evidence to suggest that bombing Afghanistan into the stoneage helped find Osama bin Laden or smash his al q'aida network.