If you don't expect the world to be fair or kind or logical, that can do wonders for your state of mind. This doesn't mean that you scoff at fairness, kindness or logic or in any way devalue those qualities or others. It means that you don't lead with your chin.
Now before the "What you expect is what you get" crowd gets upset, let me elaborate. You will certainly do your best to be fair, kind and logical with others (and with yourself) and you should avoid expecting unfair, unkind or illogical behavior, but you should not be surprised if people fall short. Some of the most idealistic people I've known are regularly disappointed by others because they have expected them to behave like saints or near-saints.
I believe they overlook how messy life is and how experience is often a better guide than reason.