Well, in the really useless artsy fartsy courses, ya, you'll often run into profs who misuse their position to promote a political or social point of view. But college is so much more than that.
Take a business program and you'll get a good overview of business. No, it won't teach you every little detail, or how to be the embodiment of entrepreneurship, but you can be sure you'll get a better, more rounded and less self-destrucitve overview than making all your own mistakes to figure it all out yourself. And, you'll probably be exposed to topics that you'd never envounter running your own little gc business, and who knows, maybe open up a whole new area of interest or a new chapter to your life.
Or take an engineering or applied sciences program and you'll discover a conmpletely opinion-free zone filled with people of a brilliance most have never imagined and have your capacity for abstract thinking expanded.
At the very least, a good college program - again, avoiding the useless artsy crap - is an excellent exercise in developing your ability to integrate large amounts of complex concepts, digest it, and apply it to new problems. You might not use a lot of the actual information - it's the mental, rational and reasoning skills you develop that are the real education.
Some people are blessed with these skills and don't need to develop them in a formal setting. They are the exception and only fools assume they will also be the exception.
Also, from a strictly practical point of view, many jobs are open only those with the piece of paper. Those who have proven they are able to knuckle down, follow the program, and complete a massive task. Having that piece of paper, that proof, opens up a world of possiblilities, many of which you have not even ever imagined.