Yeah I think you make a good point about insecurity, I bet that does drive a lot of people. Given some of the bashing behavior I see people engage in, I think insecurity is definitely a factor.
In my experience with depression: while it does span months/years at a time, things can be different from day to day. If we're talking about happiness a scale from -10 to 10, a Major Depressive Episode is not just 6 months of feeling -10. There are days where you can get up to a 0, and maybe moments where you're up to 3 or 4. It is in those 'breaths of fresh air' where I, and I imagine others, have the capacity to think "WTF is going on here, and how do I make this not happen again?" Then its just a matter of making a plan, and putting one foot in front of the other, even at -10.
In my experience with depression: while it does span months/years at a time, things can be different from day to day. If we're talking about happiness a scale from -10 to 10, a Major Depressive Episode is not just 6 months of feeling -10. There are days where you can get up to a 0, and maybe moments where you're up to 3 or 4. It is in those 'breaths of fresh air' where I, and I imagine others, have the capacity to think "WTF is going on here, and how do I make this not happen again?" Then its just a matter of making a plan, and putting one foot in front of the other, even at -10.