You said yoga is a cure for depression, not Prozac. When people are struggling with depression and suicidal thoughts, how can reach out for yoga? This may be long term, but I am unable to understand your logic.
You can through our research work. AIMS (All India Institute of Medical Sciences) and also NIMHANS (National Institute of Mental Health and Neuro Sciences) in Bangalore, they have published papers on this. They have given all the scientific data on how Sudarshan Kriya and meditation can be substituted for medicines in case of depression and suicidal tendencies. And personally if you ask me, I have on ground experience of thousands of people coming with broken hearts, or with depressed and going back feeling much better in just five days, after doing the program.