You went too easy on Dimon. He is not the grandpa you think he is. He is a VERY sophisticated and informed businessman who knows precisely how Bitcoin works and what it is. The reason he makes such violent comments about it is because the way Bitcoin is evolving, I would expect that in 5 years no one will need banks. Indeed it is a major threat to banking. If Dimon just thought it was a silly investment, he would make some dismissive comment. But this was very emotionally charged and filled with hatred. No one speaks like that just because they think its a bad investment. They speak like that when they hate it or fear it.