Jamie Dimon is just another gambler addicted to a pastime that does nothing for the good of the country. But his team of derivative traders stinks because he does not pay enough to keep the good traders on his team. He is well known for being cheap with his employees. So the good ones leave.
In a zero sum game that will result in his team coughing up cash to the teams with the superior players.
Bankers should stick with being bankers. Just let them hold and lend money - nothing more.