Double-digit increases in the cost of health care insurance? Bill Herman, vice president of human resources at Highsmith Inc., shrugs them off. A decade ago, he saw the same. Back then, instead of merely following the corporate pack’s moves away from traditional indemnity programs and toward managed care and health maintenance organizations, Herman tried to get at what he saw as the cause of the escalation: a system focused on getting sick employees well rather than on keeping healthy employees from getting sick.