https://cdnph.upi.com/ph/st/th/2631779976543/2026/upi/9f5b4b598b6207638b987877e5c3d142/v1.5/Jerome-Bettis-Steelers-let-down-Mike-Tomlin-in-personnel-choices.jpg" /> Jerome Bettis believes the Pittsburgh Steelers "let down" former coach Mike Tomlin with their personnel decisions, the franchise legend told UPI.