It would've been boring if I was just like "it's just reefer madness all over again and enough people are drug-phobic that nobody cares about whether or not the stuff's actually dangerous," though. I mean, that's the real reason, of course, there aren't any corporate conspiracies necessary for that, but there's nothing exciting about it. It's kind of like if someone was like "why is the drinking age 21 when you can join the military and get trained to kill people for your country at 18" and I'd said something about the military-industrial complex and Vietnam.
That said, if the DEA were to mysteriously reverse their stance on MDMA for the sake of all the PTSD sufferers out there (not likely), a lot of money WOULD stop moving around and a lot of powerful people would take steps to push things back to the way they used to be.