By Rory Robinson NFL players aren’t happy about a new rule regarding the proposed ban on hip-drop tackles, even though several players were left games last season due to injuries caused by this type of tackle. Kevin Mawae, former center for theNew York Jets and union President, has been quite vocal in his criticism of how the NFL handles safety concerns in football. He’s previously said the NFL chiefs should “take their skirt off” regarding risks in professional football. However, the NFL’s head of operations, Troy Vincent, believes players often resist necessary changes, especially ones that …