Why should someone earns more pay more taxes than someone earns less?

Old McCain: “I think it’s to some degree because we feel, obviously, that wealthy people can afford more.”
Doctor’s daughter: Aren’t we getting closer and closer to, like, socialism and stuff?
Old McCain: “Here’s what I really believe. When you are, reach a certain level of comfort, there is nothing wrong with paying somewhat more.”

That was a long time ago though.

New McCain: He said “We need to spread the wealth around”. That’s one of the tenets of socialism.
Palin: Now is not the time to experiment with Socialism.