A contrary opinion on HELOC's and banks

I recently posted an article about the concern HELOC's may have on bank capital positions. Here's a contrary opinion from another blog I follow, Calculatedrisk

The following report is from housing economist Tom Lawler:
In a House Financial Services Committee meeting today on “Second Liens and Other Barriers to Principal Reduction as an Effective Foreclosure Mitigation Program, spokespersons from BoA, Citi, JPMorgan Chase, and Wells Fargo explained the potential dangers of broad principal reductions, as well as tried to dismiss the silly claim that many second mortgages have “virtually no value” because so many borrowers with seconds have total mortgage balances at or exceeding the value of the home collateralizing those mortgages. Below are some observations on BoA’s and Chase’s testimony.

I'd read the whole article as it provides some counter points to my previous post.