David Stearns’ offseason makeover of the Mets roster has led to the worst record in the majors, a product of injuries and underperformance. The team’s president of baseball operations acknowledged Tuesday that the organization would “absolutely have to look at our risk assessment on injured players.” That’s after players with checkered injury histories — like Jorge Polanco and Luis Robert Jr. — have gotten hurt, worsening an already poor showing from the lineup. It’s an offense that’s scored the fewest runs and will now feature a pair of rookies — Carson Benge and A.J. Ewing — in the outfield, despite little time at Triple-A. Stearns insisted Tuesday before the team opened a homestand against the Tigers at Citi Field that they are “not close” to trading away veteran players and that they remain confident the roster is capable of righting itself. “I do believe that,’’ Stearns said of the team salvaging the season. “But we have not shown that yet.…