Part of the stigma of depression is dismissing something as not real, not important. In your second post you clearly say that real depression is due to loss and tragedy. You seem to be saying that everything else is false, untrue, down to how our face interprets our facial expressions. For someone already struggling to reach out and ask for help, that attitude could have a hugely detrimental effect. We've dealt with lots of people on here who haven't reached out for proper help because of similar attitudes. As I said, with certain things you need to be careful about the language to use. Phrasing things a certain way can have a negative impact on a person and cause more harm than good.There is a very visible campaign in the UK to teach people that depression is an actual, real illness with real symptoms caused by real issues, both internal and external.

Also, no one is being defensive, they have countered your theory with scientific evidence. It's how progress in medicine and science works. Accepted theories and treatment change with the presentation of new evidence. You've provided none to support your theory. You're surprised that no one accepts your theory when you've provided no evidence to support your theory. In contrast, there are thousands of studies supporting the treatments already in place. That knowledge has been gained by qualified scientists and doctors doing thousands of hours of research, experiments and clinical trials, which have then been corroborated by their peers, often by replicating their experiments. Very few people are going to automatically believe a theory that has no evidence other than anecdotal in the face of all that scientific evidence based on thousands of hours of research and study.