It wasn't luck. Kennedy was an insider who, along with figures such as Bernard Baruch, cleaned up by shorting ahead of the 1929 crash. Roosevelt knew Kennedy had knowledge of all the games and so appointed him to clean things up. That led to Glass-Steagall. That was unfortunately repealed in the late 90s with disastrous results.
An anything goes attitude now leads to naked shorting and illegal activity. DWAC is already a target.
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