Why is college education broken in the US? If one is doing a STEM degree then they can earn enough salary to pay for their loans and live happily ever after. I

Why is college education broken in the US? If one is doing a STEM degree then they can earn enough salary to pay for their loans and live happily ever after. Isn't the issue when either international students come and invest thousands of dollars in university fees and are then unceremoniously kicked out of the country or students which study some field which has no high employability?