The song goes that way because Paris is attractive to young men compared to the American farms. But being attractive may not mean good. Candy is attractive too, to children. And that hard work in farms doesn't necessarily mean being less happier than your modern life, as happiness is more dependent on expectations than what you have. Paris experience raised expectations for army folks.

Sometimes, I think that the modern education setup (schools and colleges) is a recruiting and training mechanism. Bright kids from all over the country side are filtered and sucked away to work in the modern factories. Same as army recruitment camps that go to rural side, conduct running competitions and take away all the strong youth from villages.

Ofcourse, they sell education as knowledge or refinement as a person. But the real goal is to create a workforce.