Although this article is about these uses solely for research with imaging scans, past research and some spotty continuing research suggests that psychadelic substances can be extremely beneficial in treating depression, anxiety, PTSD, relationship problems, etc etc etc...
If marriage counselors could prescribe MDMA in an appropriate set and setting for the husband and wife, I think that you would not see so many fucked up divorces and kids with one parent, or guys beating their wives, because it isn't just a band-aid like anti-depressants, it can generate lasting effects on your perception of the world and the way one treats those around them.
If mushrooms could be acquired with a prescription from your doctor for use no more often than 2x a year, do you really think anyone would be out taking tons of mushrooms and shitting in the streets? No.
But it might instill a lasting sense of connection and responsibility to the larger social collective, and the even larger natural order. Scientist would love to find a way to instill a lasting peaceful and happy mood in people without the frequent use of harmful drugs, well here it is. People lament the demise of the earth and her natural resources, beauty, and wildlife. Perhaps those who had experienced the connection to it all, of "ALL", people would be more hesitant to destroy something that they understand to be a part of them and essential to their life.
There is a vast amount of evidence supporting MDMA and Psylicibin and helpful in psychotherapy for PTSD and ADHD respectively, as well as many other lines of research.
The VA is now offering limited MDMA therapy for veterans to help overcome PTSD... the pilot study was overwhelmingly successful. Add this to the work done before MDMA was scheduled regarding couple's therapy- and a small body of continuing work (scheduled substances are no easier to get for studies in the U.S.) shows that it is extremely effective in letting people talk freely, and to readily and easily empathize with others. In this day and age, the world would really be a better place if everyone was a little more conscious of their neighbor, both literally and ecologically as well.