Oh good grief:
The United States should encourage Tehran and Riyadh to settle their differences rather than facilitate aggressive Saudi action. Otherwise, the region will be plunged into an even bigger crisis without an end in sight.
What part of Iranian aggression and destabilization is unclear? The fact is that Iran is already waging war on Saudi Arabia--including Saudi Arabia's call for the Saudis to lose their status as custodians of Mecca and Medina (and yes, Iran says, if you insist we'd step up for that honor).
How is it possible to basically think of all that Iran is and does as the steady-state "normal" that any Saudi resistance would destabilize?
What part of what Iran is doing right now isn't already a dangerous destabilizing crisis?
How is it possible to think that Iran with their record of aggression in other countries would step back from that in negotiations? "Oh, sorry. My bad. Was that wrong? We'll stop."
Sometimes experts seem to live in the echelon above reality.