So even if the chief executive does not impart confidential price-sensitive information in the course of the paid-for meeting, the impression created that this might be happening would be seen as putting more moral or less well-heeled investors at a disadvantage.
The Iranians know this but have not met their obligation even at this late hour to counter this impression, and for that reason the burden of proof has now shifted: The moral, political and legal responsibility for violent confrontation has passed entirely to Teheran.