The world will never be just. But that's not germane -- doesn't matter what the world is to you anyway. It's not like you have to power to change or complain about it. It's like complaining about the spectrum of certain stars because you can't get a good tan from them.
The key question is how do you act in the world. I think many people confuse acting as if the world is a just place with actually believing that the world is a just place. When young, you may start out thinking the world is a meritocracy. Then, perhaps in school, you finally figure out that life's a bitch and then you die. Perhaps some smartass with a website or a teacher or some other authority figure takes you aside and tells you that life is shit.
What comes next is very interesting. Some folks internalize the unfairness of the world and chew on it. They hold grievances, complain about those who succeed, and feel oppressed and victimized. Other folks act as if the world is a fair place because they have decided that acting in such a way is the kind of person they want to be. They are happy, optimistic, and always looking for the good in life.
Perhaps these people always view people in pain or suffering as in some way deserving it. Perhaps the other people always view people in pain and suffering as never deserving it. Perhaps both groups secretly think of life as a meritocracy. This would be an interesting hypothesis to test.
But in either case, the world sucking is no reason for you to change your attitude one way or the other. In fact, once you figure out that you own your emotional responses to events, you move past whether the world sucks or not, because it's really not that important.
And then you find articles like this pointless or worse.