The job of governments is to create regulations that stop the worst abuses, and then have regulators that apply these regulations to the worst offenders.
Any law relies on the majority of the citizens who are supposed to abide by that law not to be arse wipes, because the ability to regulate each and every individual in the face of widespread violations just doesn't exist. If one company has child labor, treasonous dealings with enemy nations, and ignores the nominal minimum wage, employment laws and taxes they, as a company, are obligated to pay - regulators in general can deal with one bad egg.
Where it falls apart is when every single company larger than $x dollars is funneling their profits offshore, buying slaves and hiring kids, agreeing to sell their tech for the explicit purpose of oppressing a billion human beings and thumbing their nose at anyone who could hope to stop them - because at that point, it's too big for a few desk jockies; it's time to call in artillery strikes. And the US hasn't had the spine to stand up to its corporate abuses for many, many years.