I made it through college on my own and had no expectation that my parents would or could pay for it. I do not understand how it is the parents' responsibility

I made it through college on my own and had no expectation that my parents would or could pay for it. I do not understand how it is the parents' responsibility, and having done it myself, I know it is not necessary. I had to find my own grants, scholarships, and loans, and I had to find jobs. I went to a college that was nowhere near where my folks or family lived, so I was quite alone. Was I envious of others? Sure. Did I wish I had money? You bet. Parents would have been a wonderfully convenient source of money. But they were never my crutch, my expectation. I learned self-discipline, independence, responsibility, and money management. I also kept up with my classwork and never failed a class.