It doesn't matter if the country has corruption problems on it's own, we shouldn't be party to that, and we shouldn't facilitate or encourage it by doing business with them. That's the whole point of these laws.
Why is that a given? It ultimately results in our adversaries like China or Prigozhin who are willing to pay bribes getting the resources. Or even other European countries who barely enforce these laws. So American companies are forced to be at a disadvantage and no actual bribery is prevented.