We have some of the most intelligent people in the world working on extracting as much wealth as possible from high volume trading. For someone to gain money in the market someone most lose. Imagine if we had these minds working on solving real world problems that would actually benefit society. Just like gambling, trading is zero sum.
Living in this world is kind of making yourself and only yourself survive against other people to that every person in this world is trying to make out the best of it even when they know that they are stepping on someone else.