There's economic research that shows it's more efficient to regulate (in some sense, "blame") the lenders, because borrowers are often desperate. When you're desperate, you have reduced capacity to objectively judge the consequences of borrowing and are also less sensitive to "blaming", potential penalties for overborrowing, etc. From this perspective, putting all the blame on borrowers while exonerating the banks is exactly the opposite of what we should be doing as a society, if we want to avoid another debt bubble.