"Founding Fathers did not anticipate or desire the existence of political parties, viewing them as "factions" dangerous to the public interest...Politics was supposed to be rational and collaborative, not competitive"
"[Having political parties] agitates the community with ill-founded jealousies and false alarms, kindles the animosity of one part against another" - George Washington's Farewell Address 1796
They create too much divide in this nation and does not help anyone, people should be judged on their values, morals, and words not on what party they are part of as I know plenty of people who voted one way or the other not because of what they heard just because of what party the candidate was part of without knowing anything about them. It allows for laziness in voting.
It is important to have disagreeing sides, unless you want a country to morph into a one-believing one. I'm not saying either one is always wrong or right, I'm just saying if we for example, eliminated the republican party, there would be less debate and therefore, less progress. ;) cheers