...might not be possible. If you claim scientific validity for some of your arguments ('researchers have shown'), you cannot at the same time reject actual scientific evidence when it is presented to you. The article to which you link is a Newsweek interview which states that "One researcher says the drug known as Ecstasy might be an effective tool for psychotherapy" -I'll emphasise "one" and "might". As against this, I provided you with a source regarding a registered clinical trial. I am not saying that MDMA is not a possible adjunct to therapy for PTSD victims, I am saying that we do not know yet, since the results of this study are due to come out next year. But maybe you know who dies in Harry Potter too.
And then your "there is no evidence that MDMA is harmful". If you had taken the pains to follow the link I put up earlier, you would have noticed a number of facts stated in clear English with actual source references listed. Amongst other things: "MDMA can also be dangerous to health and, on rare occasions, lethal."; "A survey of young adult and adolescent MDMA users found that 43 percent of those who reported ecstasy use met the accepted diagnostic criteria for dependence, as evidenced by continued use despite knowledge of physical or psychological harm, withdrawal effects, and tolerance (or diminished response), and 34 percent met the criteria for drug abuse. Almost 60 percent of people who use MDMA report withdrawal symptoms, including fatigue, loss of appetite, depressed feelings, and trouble concentrating." Does fatigue, loss of appetite, depressed feelings and trouble concentrating correspond to your "feeling real good and happy"?
"Users of MDMA face many of the same risks as users of other stimulants such as cocaine and amphetamines."
"Hidden Risk: Drug Purity
Other drugs chemically similar to MDMA, such as MDA (methylenedioxyamphetamine, the parent drug of MDMA) and PMA (paramethoxyamphetamine, associated with fatalities in the U.S. and Australia) are sometimes sold as ecstasy. These drugs can be neurotoxic or create additional health risks to the user. Also, ecstasy tablets may contain other substances in addition to MDMA, such as ephedrine (a stimulant); dextromethorphan (DXM, a cough suppressant that has PCP-like effects at high doses); ketamine (an anesthetic used mostly by veterinarians that also has PCP-like effects); caffeine; cocaine; and methamphetamine. While the combination of MDMA with one or more of these drugs may be inherently dangerous, users might also combine them with substances such as marijuana and alcohol, putting themselves at further physical risk."

For more on the science and myths surrounding ecstasy, here's another resource: http://www.nida.nih.gov/Meetings/MDMA/MDMAExSummary.html