I agree.
The lender wouldn't be culpable for murder and mayhem (well, unless the lender was a loanshark who used thugs to collect debts).
The lender would bear moral responsibility for bankruptcies and severe economic hardships.
Yes, that's where I was trying to go. OF COURSE they're not in any way legally or morally culpable for the murder. But IMHO individual lenders who approved the later-stage loans are morally culpable for sending this couple over the edge into what should have been a bankruptcy instead of a murder, if they knew, as they must have, that this couple was ridiculously over the edge and could not possibly repay.