Almost 350 comments, none of which mention how dangerous MDMA is, especially to the kidneys, the heart, and the serotonergic neurons of the brain?
The process for drug approval is extremely rigorous for a reason, and does have some downsides as a result. Let's not negate that work please by ignoring all of the hard work that's already been done to show exceptionally safe viability within the context it's being used in.
As noted above/below in different comments, the dose/dosing period/etc always makes a difference in whether a drug is harmful or helpful. In this case, the benefits strongly outweigh the downsides within this particular narrow kind of usecase, and of course hopefully we'll be able to get an even better handle on that in a broader set of examples in the ongoing Phase IV studies.
Plus, it's not like MDMA is some new chemical or anything like that. It's pretty darn well characterized under a variety of treatment/usage conditions at this point.