No one actually argued for socialism - clearly the comparison was between America and European countries, and that broadly, Europe's brand of capitalism results in less extreme wealth inequality.

Notably, Bill Gates, Steve Jobs and Jeff Bezos did not provide a service.  Their employees did, and yet their employees did not receive the appropriate value of the labour that they did - hence why some people become so rich, surplus labour value.  Just like how owning a machine does not mean that you made the cloth from it - it was done by a mixture of the workers and the machines, but people who own this property feel that they have a right to more than an amount of money proportionate to the amount of work they did.

Even in European countries this is a problem, but without socialism which is often economically flawed there are no viable solutions, so all America can do is adopt the slightly less right wing systems of countries like Sweden and Norway, which have very high standards of living and economies, as well as being havens for social progression in my opinion.