Life Isn't Fair--An Outlook Rooted In Desensitization

We often hear the words "Life Isn't Fair" whenever we talk about that which is unjust and wrong. While it certainly is true, the problem is that we have simply grown to accept this fact without a second thought. We either hear it or say it and simply move on with our lives as if that is the way it's supposed to be.
I see this as problematic as I feel that this seriously diminishes the quality of life for most people.
Why do we accept this unfairness without even thinking about it? Are we so desensitized to injustice and inequality in the world that we observe the unfairness and continue to live in it without questioning it?
I'm not saying we can erase all unfairness in the world and create a world of perfection. We will never have a perfect world and most people are not even aiming for that--not even The Venus Project is aiming for a perfect world. However, I believe that we can always strive for a better world and always seek to improve life for all people. I believe that this is possible. We will never have a perfect world, but we can certainly have a better world.
My thought is that in order to have a better world, we need to change our thinking.
I think we need to stop accepting unfairness as a natural part of life. Keep in mind, however, that I am talking about injustice, inequality, and the type of unfairness that does real and long-term harm. I'm not talking about minor and trivial little bits of unfairness that really don't matter, such as one kid gets a bigger cookie than another kid, or someone in a relationship puts everything into it while the other person puts hardly anything into it at all. Those are examples of unfairness that might never go away--but they are trivial and do not actually do anything to diminish the quality of one's life or the lives of others.
I'm talking about unfairness that can damage someone's quality of life or the quality of life for many people.
We need to not accept these as normal parts of life and we should be against all injustice.
What's the point of life if most of us are just going to be treated unfairly and struggle? Life loses it's value when we have grown to expect this of life, and life becomes virtually worthless if we accept it.
I have a problem with the negativity that most people have grown to accept as simply a fact of life because I feel like they destroy our quality of life. You should not accept injustice. You should see it as wrong--you should be against it and speak out.
If you accept them, you are part of the problem. It's time to become part of the change, so it's time to start giving a damn.