What we call "depression" may be many different things, in fact. "Depression" is a label. The WHO worked to have an universal definition and also investigated different approaches to it, particularly in low income countries. Cross cultural studies has been made from different perspectives. Some scientists believe that an universal approach is possible while others give much more weight to cultural factors dismissing universality (relativism).
I do appreciate psychiatry although I am aware that is also a tool for society to have things under control. Making us swallow Prozac is easier than producing changes in a sickening environment. We must fit in even though some norms, structures, places, etc are inhuman and degrading. I do not trust 100 percent in Psychiatry. Call me paranoid if you like