with proper protection laws, there's no real reason children
  couldn't work. But a majority of the USA is in the top 1% of the
  world (over $34,000 / yr) and children don't need to work
  generally. But in more impoverished countries, it's just a
  simple necessity.
  Good-intentioned "let's break up the shirt factories" don't
  understand. Those countries may need better "safe environment"
  laws, working conditions, whatever. But busting up the factories
  leaves families starving. Nice intention but disrespectful to
  the local economy: BIG WHITE FEET stomping all over the world,
  in the name of GOOD... _sigh_. Real change is usually more
  subtle than that, bit by annoying bit.