I doubt that "proof" will be needed. A strike against Iran's nuclear facilities (as long as it wasn't nuclear) would just happen. Declarations of war don't happen any more.

I have always thought that the main aim in Iraq was to get some permanent military bases.   That is one of the main sticking points in the Americans getting out. People have been trying to get the administration to say that they have no intention of remaining permanently, but no one will. They want those bases they have spent millions in creating. The Saudis kicked them out, and (apart from Kuwait) the nearest bases are in Dubai and (I think) Abu Dhabi, some distance away.

yours,

Peter T.