We can dismiss those ideologues and "true believers" in capitalism who falsely portray it as the fountain of all human abundance and technological advance.
Ayn Rand and her disciples are the most egregious in this regard, totally falsifying human history.
American capitalists DID starve and murder workers, as recorded by such honest social investigators as Upton Sinclair, Ida Tarbell, and Lincoln Steffens. Capitalism DOES NOT hold integrity and trustworthiness as cardinal virtues. Under capitalism, greed and criminality pay off in the marketplace, thus demanding that men survive not by means of virtue, but by means of vice.
America's "abundance" has always been the exclusive possession of the capitalist class--not the working class. Even when some amount of the "abundance" was shared with workers--as during the 1950's in America and Europe--this is only a temporary situation and soon devolves to the impoverishment of workers beginning in the 1960's and continuing into the Second Great Depression of the early twenty-first century.
Capitalist apologists (true believers and ideologues) claim that capitalism is the epitome of economic systems and has produced the greatest advance in human development in history. Of course, a thinking person has only to look around at the current human and societal devastation that capitalism has wrought to see that this is a lie. Even some counterfeit progressives claim that capitalism produced beneficial results.