I don’t think that his plans for Mars are good for anyone but himself. Creating a small privately owned Mars colony is more likely to increase problems like climate change and inequality than reduce them. If it were Nasa or another government agency, we could argue that technological advances from the attempt would benefit everyone, like they did in the space race, but this won’t even do that. Best case, it makes him even richer. Worst case, it pumps a lot of carbon into the atmosphere and wastes a bunch of resources for no benefit.