OMAHA, Neb. Apr. 30, 2011 -- For the first time, Warren Buffett acknowleged that he should have pressed David Sokol for more details about his purchase of Lubrizol shares before Berkshire Hathaway (BKRB) decided to buy the chemical company. The hot topic of the Sokol affair dominated the opening hour of Berkshire's annual shareholder meeting here on Saturday Apr. 30, as Buffett responded directly to the public clamor for more details on what he knew on Mar. 15 about Sokol's betrayal in allegedly violating Berkshire's code of ethics and rules on moral and insider trading. Buffett described Sokol's behavior, which Berkshire's audit committee has concluded abused the company's basic honor system and legal rules as "inexplicable and irrational" that defied any logical explanation. Sokol resigned his top positions at Berkshire after news leaked out that he had accummulated shares of Lubrizol -- before he recommended that Berkshire buy the company.