No 737s crashed in the US, so why would the FAA be on the hook for anything? Shouldn’t the civil aviation authorities in Ethiopia and Indonesia be the ones “in trouble?”
Your point about Ethiopia's and Indonesia's agencies (and airlines) is reasonable, they ought to do their own due diligence on the aircraft that they use & allow on their turf. Smaller countries and agencies with fewer resources than us have tended to trust our FAA and the aircraft manufacturers to assess these risks. In that sense, the FAA's failure to regulate the Max and it's policy of outsourcing regulations to the manufacturers themselves is (rightly so) truly embarrassing for the FAA, is resulting in loss of trust of the US FAA globally, and maybe on the bright side is going to cause all other countries to start doing more of their own due diligence.
The last thing Boeing or Airbus wants is to have to prove their aircraft for every country in the world.