I would guess that if you posted your list of bad credit rating users, then the community might react by not upvoting those accounts. So, depending on how much they had in the first place, it might be harder for them to earn more going forward.
I don't expect you to get all bsanders on them.
Oh..well. theres a difference of paying back late and taking the money and run. Late = probably not another loan. But I think I will be transparent with credit ratings..