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.
Agree with you, they can change many people life with their ideas and hard work. I'm afraid people with skill and knowledge like that never show their works because people have negative ( mostly ) opinion and some of them against. That's why they keep stay living in garage/ room with out many disturbing. World need them but also respect their work.