Politico runs an article with this title,
Biden's team is blaming Iran for American deaths. How will the US respond?
People are pressing Biden to respond appropriately, sometimes referred to as "proportionately." Here are my thoughts.
Iran strikes us using their regional proxy forces, typically of Arab rather than Persian membership. This way they preserve a fig leaf of deniability. We should do likewise.
Why don't we get some of our proxies in the region to strike Iran for us, Israel comes to mind but there may be others. Maybe sink some Iranian naval vessels with torpedoes of non-US manufacture. Or get Mossad to assassinate Iranian diplomats traveling in the region.
My favorite idea is to get Ukraine to cobble together a few Iranian drones from crashed drone parts so we can fly them into Tehran. What would be more delicious than hitting them with their own drones? Maybe quietly depositing some Chinese or Nork mines in Iranian harbors?