"Thus am I embarking on a journey to test my own (but supported by some science) hypothesis that mental illnesses arise primarily due to disruptions/abnormalities in one's life-and therefore can be logically remedied by tracing the problems back to their root causes and addressing them."

I can agree with that to a great extent. Although, I'm sure there are instances where it doesn't apply. I believe some mental illnesses can have a lot to do with an imbalance within the body. Possibly caused by a disease? But for the most part, I also believe that in most situations, finding the root of the problem and addressing it can be all the therapy we need. I believe emotions are a warning sign telling us whether or not we are making the right choices in life. If you are feeling depressed, something needs some rearranging in your life. If you are feeling happy, you are maintaining the right balance. Although you have people you lack emotions, and that may be a warning sign in itself that something occurred at some point in your life to disrupt your ability to feel on an emotional level. The easy part is understanding. The hard part is doing.