Well, I have no idea personally about MDMA, but many, many drugs are very dangerous to those organs and neurons. For example, any anti-fungal is pretty toxic to you too. Or Chemo. Acetaminophen (Tylenol) is not easy on your liver.
Everything in medicine has a risk factor that must be weighed against the benefits.
Comparing it to chemotherapy doesn't really undermine my point, does it? And the ultimate goal of the proponents is not just to get these drugs made available via prescription, but to make them as legal as marijuana.
Everything in medicine has a risk factor that must be weighed against the benefits.