Pretty much the expected reply. Which then leads directly to if it's so easy to conclusively show what happened that what didn't can be discounted as a possibility - how come the US haven't offered more proof? Can't say lack of proof from Iran is evidence they didn't and lack of proof from the US is evidence Iran did.
You're operating under the assumption they need to show you proof. What makes you or I Important? Nothing. They'll show proof to those who matter.