Because politicians on either side don't get to be life long career leaches by fixing problems and making concerned arguments to the masses. This is because we as human beings are pre-dispositioned to polarized arguments. A byproduct of that polarization is the general ease at which a tipping point occurs in the voting practices of an individual who instead of having to comprehend some incredibly complex issues, can choose a whole side over the other, while re-enforcing an illusory superiority, generally stemming directly from 30 second snippets of biased information. You can see and hear 2 opposing pundits insult each other, sometimes rather viciously, usually directed at the others intelligence, yet you know that neither is stupid. Watch the audience clap along. You must never trust these people.