By Diane Bartz WASHINGTON (Reuters) – The chair of the Federal Trade Commission, Lina Khan, on Tuesday said giant companies like Ticketmaster, which faces a tsunami of criticism for problems in selling tickets to a 2023 Taylor Swift tour, can become “too big to care.” Speaking at the Wall Street Journal’s CEO Council Summit, Khan said it was the Justice Department that approved the merger of Ticketmaster and Live Nation in 2010 and referenced a report that the department had a probe under way. “There can be concerns that when firms become (large) they can become too big to care,” she added, sa…