Greenlight Capital’s David Einhorn has knocked shale-oil drilling as not profitable enough. Photo: Getty Images Talk about throwing the baby out with the frackwater. It seemed like the entire North American hydrocarbon industry was tarred with the same brush on Monday when Greenlight Capital’s David Einhorn presented at the annual Sohn Investment Conference . The hedge-fund manager’s chief target, the “motherfracker” as he dubbed it, was Pioneer Natural Resources Co. PXD -3.14 % The charge: Shale-oil drilling chews up too much cash for too little benefit. Two companies set to report first-quarter results Wednesday, Denbury Resources Inc. DNR -3.62 % and Chesapeake Energy Corp. CHK -3.23 % , bear only a passing resemblance to the accused. But they dipped by 2.8% and 1.6%, respectively, in the minutes after Mr. Einhorn’s comments. Their results certainly won’t be pretty. Analysts see Denbury reporting […]