The message comes from Wal-Mart, but it reflects a view that's increasingly common in corporate America: The US healthcare system needs to be fixed. Big business can help, but don't expect us to shoulder the whole burden...That was a subtext when Wal-Mart chief executive Lee Scott took the stage...Mr. Scott emphasized that the responsibility must be shared by government and individuals as well as business...In last week's push for universal coverage, Wal-Mart was joined by other major companies: Intel, AT&T, and Kelly Services.