It depends on the person. Major depressive disorder is an inexplicable depression that is not brought on by the circumstances of your life, I think SSRIs are a suitable treatment for that. I think that it's important to consider all factors of a persons life when deciding whether or not they should be prescribed medication that suppresses ALL emotion, not just negative emotion. Positive constructive therapy to help people better their lives ought to be considered in cases that may not necessarily be a disordered condition (i.e., they have a shitty life and need to be a better person to themself and others to be happy and feel good about themself)