This is absolutely false. Great colleges are extremely hard, and in top programs kids are always fighting for life to not get kicked out.
To me, CMU taught invaluable lessons in hard work, getting kicked in the teeth over and over, surviving mostly on coffee and alcohol, and persisting till success comes along. All these lessons help while starting a startup.
A great college program will make graduate's problems feel small in comparison to what they put him through.
Besides, starting a company is not the only entrepreneurial work one can do. Is Sundar Pichai less or more entrepreneurial than Zuckerberg? There are far more ways to inhibit courage than starting a company.