>assets capture by tiny percent of the population
Those asserts were _created_ by a tiny percent of the population; if they hadn't been allowed to create those assets then they wouldn't exist. Europe is an example of that: it has only 2 companies in the Fortune 500 (500 biggest companies) that were created in the past 20 years, i.e. essentially no tech industry there. Because the policies there make entrepreneurship comparatively quite difficult.
And is life in Europe actually worse than the US as a result? Capitalism has convinced people to think that the end goal of life is creating value. Maybe that isn't the thing society should be optimizing for.