On paper, Communism can appeal greatly to the lower class.

However the reason why Communism never really worked was because somebody had to first take charge of the country and make sure that the country was secured.

Then what was supposed to happen was the government would eventually fade away leave the people independent.

But that never happened because most communist leaders were too busy making themselves overly powerful and corrupt and eventually the entire system collapsed on itself.

Ultimately, the reason why communism doesn't work 99% of the time is because their leaders usually end up abusing their power and turning away from the "true" form of communism.

Now for Capitalism, it's quite the opposite.

On paper it sounds kinda unfair to some and can also be pretty easy to abuse.

However you can't deny the idea of being able to make more than a given amount isn't appealing to most people.

Besides as Doctor said, the U.S. has long implemented safeguards to prevent most forms of corruption within the capitalist society which sorta give a socialist vibe.