Thoughts Change to Suit Personal Desires?

Loose topic... Why is it that so many people decide to pretend to believe something when they want some form of personal gain. A personal belief is something to be treasured, not flung around like some monkey's crap. A person with pure opinions is someone of pure thoughts. Someone who decides to use thought to try and justify an outer action, is simply giving away any purity of thought that they have. For example, a court sentence rolls in a certain way and the person doesn't like it, so they begin to falsely accuse the jury of being bribed or something of the sort.

This bugs me... A lot, because it happens every day and everybody does it. Why do people insist on believing bull crap about somebody else in order to suit their own desires? Selfishness, I believe that selfishness drives this form of thought in people. People want power, it's a simple fact. Everybody knows it, the thing is people want power and they don't want to do anything, so the way that they seek to gain power is by putting everybody lower. Since trying to make yourself look better would take work, why not run around talking bull about everybody that you need to be knocked down a notch, that would be easy and probably a bit fun when you consider how much creativity you could have with it.

So, when we see that people are changing their thoughts of certain topic's all the time to suit their own greed, I cannot help but see a serious flaw. We all know it happens, we all know how much hurt it does, and yet we still do it. Things like the 9/11 attacks were brought on because certain groups of people decided that they wanted to take some power, how did they go about that? They attacked the most powerful country they knew, America. Now, instead of spending several billion dollars on strengthening of the country, we are spending that money on war, doing exactly to them what they did to us in order to restore the food chain to the way it was without having to do any work on our side.

The evil cycle of all of this is that, we will never, ever gain anything if this continues. Every single person is out to get every single person, and as people get brought down, people begin to be less productive and the world starts to become a big mess.. The only thing that can possibly be left in the end is someone on top, why not fight to get to the top and high a large wonderful world to live in. This simply seems like something almost too obvious, I mean, why build when you can destroy? Does that make sense? Will you gain power by dragging others down, or building yourself up? That part is up to you.