Paying a teacher to teach ≠ buying a credential.
Failing to teach a student ≠> the student is mediocre.
The student is mediocre ≠ the student is irredeemable and didn’t deserve an education in the first place.
Honestly, it’s wild to me how reluctant people are to accept that teachers have a responsibility to teach their students.
They will charge you $2000 a credit hour to have a teacher teach you — as if the teacher alone is the gatekeeper of an education — and then claim that the teacher is not in any way responsible for the student’s success or failure in being taught.
How is saying some students get weeded out the same thing as saying the teacher has zero responsibility to teach any of their students? Whether or not you pay or get paid to be at an educational institution, you should be weeded out (early, preferably) if you aren't going to put in your part.
A portion of the educator's role is weeding out students who are not wanting/able to engage with the material before they spend a massive amount of time and money towards stepping stone classes to something they won't try/be able to complete. A portion of the student's role is weeding out the teachers and institutions which are more interested in maximizing the money out of the student instead of teaching them well. The two weeding processes actually reinforce the right outcome together - students getting educated instead of wasting their resources.