> I've never seen evidence of the invisible hand helping anyone but the owners.

Just look around you. Adjusted for inflation, the median annual income in 1920 was $41,544. For 2018, it hit $61,372. The median person these days has $20,000 worth of more stuff now than they did 100 years ago. That's only possible because of growth, and the trade and competition that goes with it. That competition has driven down costs and drove innovation. We have luxuries people couldn't have dreamt of back then: phones, grocery stores stocked full of food, safe jobs, drugs and medical treatments that would seem like sci-fi.