If you are driving down a country road and see the remains of a very recent crash with the driver and passengers trapped inside crying out for help, you may have no legal obligation to stop and try to help them.
But I presume that most of us would at least try.
Much worse than a mere car crash, the people of Iran and Venezuela are crying out for help. The United States may have no legal obligation to answer the cries for help. After all, we are not the “policemen” of the world.
However, I know how I’d like to be treated if I were in their horrible position and was one of the multitude who was crying out for help.
As an additional consideration, I believe that it is a very defensible position to contend that our providing help to those endangered people also happens to be in our own long term self-interest.