Last month, Philadelphia Eagles speedy receiver DeSean Jackson almost got himself released when he shared on Twitter quotes attributed to Adolf Hitler. It was a bizarre public display of misjudgement, but not totally out of character for Jackson. He has open ties with Los Angeles gang members, owes his past agent $1 million, lied to police about a recent robbery at his home and created enough trouble that he was traded by the Eagles years ago before being resigned last year.

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So why the odd behavior? Immaturity? That could be the explanation, though he’s a wizened veteran in the NFL at 33. Many football players have shown evidence of similarly erratic behavior, some while still playing and many after retirement, and many attribute it to concussions. In 2002, Dr. Bennet Omalu discovered a possible link between NFL players who’d received routine head injuries and a condition […]

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