...People caught on fast. In some neighborhoods in Chicago and Miami, it seemed like everyone made a bogus application to the Small Business Administration’s Covid-19 Economic Injury Disaster Loan program.... ...The SBA’s much-vaunted new computer system, built by an outside contractor for $750 million, proved blind to certain types of fraud and sometimes awarded grants even when it spotted disqualifying features. The agency pressured loan officers with little training to churn through applications quickly, while making it difficult for them to detect or report suspicious ones. ...