Earlier quoted context omitted.
The whole point of repossession is that he bank can sell it to recover at least some of their loss. Without that, it’s just destructive punishment. You’d be making society poorer by restricting this person’s job prospects, with no gain anywhere to offset it.
I don’t know how you get “the whole point” as being that. The credit scoring system likewise doesn’t give the lender anything to resell and merely punishes the borrower, but we recognize it as having positive sum effects for the credit system. A program of revoking degrees would behave the same way. (Even if you have criticisms of the credit score as it exists today, most at least see the merit of “hey, other lenders…
Revoking degrees would be equivalent to burning down houses in foreclosure. Such destruction of value is obvious madness.