Like 100s (?) of Americans killed by Iran ever.
Compare to Iranians: Affected by the aftermath of the American coup of Mosaddegh (ultimately leading to IRGC's existence), providing weapons to Iraq for the Iran-Iraq War (200K deaths), etc. + decades of stupid policy trying to take their oil in the name of "regional security" (for "our" oil).
How would it work? Do you expect a 1:1 casualty list? 1:1 list of events? Should the US citizens allow for a coup on US soil carried out by the IRGC?
And, courage of their convictions, if their own people are so inherently evil for making “the other bastard die for his” they should be renouncing citizenship, yielding their ill-gotten wealth, and self-immolating for their nations eternal shame.
Categorical reasoning as applied to war does not yield a tit for tat, its category versus category. All of column B to preserve any column A. “Not worth the bones of a single British Grenadier”.