Please read it again. It was hypothesized that you could have a hard time getting a college loan if your parents had bad credit. Now, you could construct an argument for why that policy makes sense for credit issuers, such as 'statistics show that 87% of debtors' children go on to become debtors themselves'. But the underlying objection was that you shouldn't need to go into debt to get access to higher education in the first place, ie college should not be insanely expensive and you should be able to manage the academic and financial demands with a part time job.
