Like the old saying goes: Hindsight is 20/20. That's especially true for financial markets and the Federal Reserve. So, while investors wait to see whether the Fed will signal the possibility of a 75 bp rate hike at its next meeting, JPM CEO Jamie Dimon is telling Bloomberg (and its audience) that investors should take a deep breath and trust the Fed, while acknowledging that there's "a chance" of a policy mistake that could trigger a punishing recession. On that front, Dimon told Bloomberg during a recent interview that the Fed should have moved…