My question has been pretty much answered. I have a better understanding now. Thank you all.
An example to my question, "Why focus so much on what we do wrong, which further exacerbates the problem?" - In my experience, the less I focus on what I do wrong, the more it tends to fade away, if that make sense. The more I focus on what I do right, or what I want to do right, then that positivity puts itself in my life.
An example - I wanted to do a yoga fitness program. I had a difficult time starting this. If I missed a workout, I would feel bad, and then eat bad food (which I was also trying to eat a mostly raw vegan diet). I would say, "You messed up, Justin. You missed the workout. You did wrong." And that focus on what I did wrong perpetuated missing workouts.
But then, I changed my thinking. If I missed a workout, I didn't think about it. I didn't think about where or how I messed up. I just accepted it and went about my day, and I thought about tomorrow's workout as if I hadn't done anything wrong by missing today's workout. The next day, I did the yoga fitness workout fine. And so on.
By not focusing on what I did wrong, and bringing my attention to positive things, the negative (missing the workout, eating poorly) faded.