> The actual blunder was exposing that weakness to the world.
The world already knew.
The real strength of the prior admins was in simply not needing the military force. The 2015 Iran nuclear deal is a relevant example here. It didn't cost the US anything.
I mean it really didn't get us anything either. It's not like Iran stopped working towards nuke when they signed it.
It did, however, allow the Khomeini regime to murder its own citizens with impunity. So someone paid.