Jamie Dimon is a very smart man. He has to be. And smart men know the consequences of their actions and the influence that his words have on markets around the world. He had to know that his negativity on Bitcoin would lead to a price drop. And if he didn't view Bitcoin as a threat, why bother commenting on it, especially with such bitterness that he would fire any banker supporting the coin. He knew what he was doing, and he knew that he was going to make a profit on the dump.