This isn’t a very good argument. Table salt is literally Sodium and Chlorine, both of which are extremely toxic to humans but that’s irrelevant to anyone who understands that molecules have different effects than other molecules that share part of the same name.

Again though, mdma can kill you even if it’s completely pure. This is especially true if you take MAOIs or drink not enough/too much water or take any other meds that mess with serotonin. Please research things carefully.