I beg to differ. I've seen a couple of bad trips on tested, simon-pure MDMA.

My theory as to why is that people don't take it seriously, and don't understand that they can still end up with beliefs that are contrary to the fact. Second, it allows people to release emotions that have been trapped inside them, and that can result in drama.

Psychedelics are amazing drugs, but they are also powerful, serious drugs. All of them, including MDMA, should be approached with respect.