The photos and statements in the quiz were all taken from Sad and Useless website. I've just added my interpretation to your view of them. So no, it's not objective nor scientific, just like all other personality quizzes. But I dare to say that it's more intelligent than most of them. And it has pictures of kittens inside!
You are incredibly optimistic. You believe that life is just and everything happens for a good reason. You believe that mankind is inherently good.
If you are under the age of 12, it probably means that you had a good life so far. You are lucky!
If your age is 12-15 it probably means that you had a good life so far (you are incredibly lucky), but you fail to see that others may not be as lucky as you.
If your age is above 15, you are in deep denial of reality. It may comes easily to you, or you may be struggling to keep this view of the world.
You may think that being so optimistic and human loving makes you a better person, but this is certainly not the case if you tell people in distress that "it's all in their heads", or that they should "just think positively" etc.
You are an average person. You are aware of suffering and injustice in this world, but you rather ignore them, or rationalize them, for otherwise it would be difficult for you to carry on with your life without going insane. You generally believe that bad times will be followed by better times. You probably view yourself as realistic, but you are unable to acknowledge the harsh realities of life.
You are mature and brave enough to acknowledge the disturbing horrors of life. You may be suffering from depression. On the other hand, you may find your approach as liberating and vital in order to have a better life, and may even be averagely happy. In any case, your perception of life is more realistic than that of "normal" people, as shown by many studies.