So uh, you know you just described the opioid crisis in a nutshell right?
Modern opioid painkillers are in fact generally if not entirely accurately, 'heroin based products.' Not just that, prior to the Narcotics Tax Act of 1914 it was kind of a free-for-all, Bayer was selling heroin too! Opium was used to settle fussy babies (note, I'm sure it was very effective). [1] They were approved by the FDA. Then, of course, the FDA went after the makers of these drugs and tightened access to the drugs themselves.
[edit] If I were to offer a generous interpretation of the actions of the SEC, it would be that they didn't want to be seen as killing innovation in the crib. They gave crypto latitude, and then they decided they really didn't like what they saw. It's kind of a 'damned if you do, damned if you don't' thing - you either kill it early and get reamed for that, or you let it fester and get blamed for ever having allowed it at all.
[1] https://gizmodo.com/when-opium-was-for-newborns-and-bayer-so...