First off, job training is not what college is for. There are technical schools and other institutions that do specialize in job training, and students who primarily care about becoming qualified for a particular job are generally better off attending one of these institutions.
But most 18- to 21-year-olds don’t actually know what they want to do for the rest of their lives; most will end up changing careers at some point; even those who do know for sure that they want to go into, say, business or computer science will probably end up doing most of their learning on the job – both because the field has changed and because there’s a limit to what you can learn in a classroom. The fact is, college isn’t all that good at providing job training. It is pretty good at providing students with flexible, transferrable skills that they will use in most careers: how to write clearly, how to think critically, how to learn and retain new information, how to complete a long-term project when there’s no one standing over your shoulder. This is why many employers and some professional schools just want a BA from a respectable school in any subject. If you know how to learn, you’ll be able to learn the specific things you need to know for your new job quickly enough.
But even those skills aren’t the purpose of college. The real purpose is pursuing study and learning for their own sake – a luxury that used to be available only to a small minority of the population. (In fact, “liberal arts,” by definition, means the studies that are appropriate for a free person, someone who isn’t bound by the immediate necessity to earn a living.)
This may sound like an archaic and elitist notion today, but in fact, we have the rare good luck to live in a society where almost everyone can afford to be free for a few years. Most students who truly want to spend four years pursuing the life of the mind can find a way to swing it. That’s a precious opportunity, and it shouldn’t be squandered; students can and should be encouraged to find their intellectual passion, whether it’s computer science or medieval French literature, and spend those years living and breathing it, because the chance won’t come again. (Not all of them do find it – there are certainly people who earn a bachelor’s degree without discovering any passion whatsoever – but it’s sad when that happens. It’s a sign that the student has truly failed college or the college has failed the student, even if they’ve got the piece of parchment.)
If you’re one of the lucky ones who get to pursue your passion for a living, great. That’s icing on the cake. But it’s still a pretty darn good cake without the icing. I’d feel enriched by my humanities degree even if I had gotten a data entry job instead of going to grad school; it has made me more capable of enjoying books and film and art, more aware of how many things there are out there to enjoy, more capable of following an interesting discussion on the SDMB or in real life, more aware of the influence of history and culture all around me. I expect this will still be the case long after my working life is done, if I live that long.
That’s why.