contentment vs. happiness vs. complacency

Re: contentment vs. happiness vs. complacency

I know that it is illogical when it comes to Zardari, Nawaz, corrupt politicians, bureaucrats, and Pakistanis who are always looking for short cuts in their life. But then, for vast majority of people in this world and all nations, it is only when they struggle (work hard, strive) to make their conditions better, they develop resources (due to their struggle, strive or hard work) and get/achieve abundance (plenty).