SpaceX have shown that reusable boosters work. Very few believed it was possible to make, but brilliant minds and science have made it possible. They are working on making the 2. stage of Starship reusable too. The purpose is to get much cheaper into space as well as to become multiplanetary with a presence on our Moon and later Mars. This can benefit life on Earth as SpaceX shows how quickly new technology can be developed when willingness and great resources are put into it! A fully functioning Starship is likely to be developed very soon, but it just needs to appear.
While science have made SpaceX a success so far, the CEO supports conspiration theories more now. Conspiration theories lead to less science because they work against what teachers are working for. That and the uncertainty of what will come out of sending satellites into orbit for the military calls into question how much it will actually benefit future generations.