The country is reeling after a recent shooting in South Carolina left six dead, including two children. Even more shocking is that the killer is former NFL player Phillip Adams, a 32-year old athlete who left the league about five years ago. It is unclear why Adams would commit such a senseless crime, mainly because it appears that he does not have a meaningful connection to the victims. In an interview after the shooting, Adams’ father said he suspected that playing football for so many years might have been what caused Adams to act this way. According to the elder Adams, such a crime was totally out of character for his son, and he had suffered extensive brain injuries from concussions over the years. Unfortunately, traumatic brain injuries are becoming more and more common. In a city like Los Angeles, where there are several professional teams, they are becoming more…