One man...one vote....how is that selfish? In fact the very act of voting is an expression of self interest. We group together with other individuals who express similar values to achieve these values translated as political outcomes. We call these groups political parties. To follow your ideology as expressed in your post would present a political viewpoint of collectivism also known as Globalism or the much vaunted New World Order. Collectivism is a tool of the liberal. Individualism and self interest is a mainstay of Republican ideology and the free market. You would have everybody be equal, presumably out of some skewed vision that life must be...and can be made to be..."fair." I submit that free men aren't equal...and equal men aren't free....and life isn't fair.
When I vote, I think about the party as a whole...not my individual likes and dislikes.