Big banks — recently JPMorgan Chase, U.S. Bank and Wells Fargo — are tightening standards for mortgage and home equity loans. Wells Fargo is only allowing customers with at least $250,000 in liquid assets to refinance; JPMorgan JPM, +2.69% is requiring 20% down and a credit score of over 700. They’re worried, apparently, that Main Street Americans can’t be trusted with credit. I beg to differ: In the Great Recession of 2008, big banks closed their doors on many middle-class Americans. Credit...