Iran kills some Americans

Neither Iran nor its proxies need to be involved for this strategy to work. Israel supports as many Islamist groups in the wider region as Iran does. This isn't secret, its overt policy*: see Israeli support for Islamists in Syria. In all likelihood an attack on Americans will come from one of the Mossad supported groups.

*Tbf we do this too, and its always bitten us in the ass. Also see A Clean Break: A New Strategy for Securing the Realm, though the wiki page is pretty sanitized.

Iran kills some Americans

Neither Iran nor its proxies need to be involved for this strategy to work. Israel supports as many Islamist groups in the wider region as Iran does. This isn't secret, its overt policy*: see Israeli support for Islamists in Syria. In all likelihood an attack on Americans will come from one of the Mossad supported groups.

*Tbf we do this too, and its always bitten us in the ass. Also see A Clean Break: A New Strategy for Securing the Realm, though the wiki page if pretty sanitized.