> What evidence have we ever seen that allowing wealthy individuals to make more money results in increased utility?
SpaceX is a modern example.
Historically, people of great wealth have been able to invest in great projects. Scientists historically have been wealthy people. The guy who won WW2 was a wealthy man who invested his fortune into developing radar. Many historians believe that radar shortened the war considerably and saved an awful lot of lives. Wealthy people donate a ton of money to universities to fund research. (UW has a Gates building and an Allen building.)
> on environmental and social concerns
The Gates Foundation, for a modern example. For a historical one, see the Carnegie libraries.