Incompetence: Opposing parties refuse to cooperate with eachother, and only work for thier own political gain, creating a system in which important issues hardly see any kind of resolutions. Adding to this, nearly all are corrupt and work in a deeply corrupt system in which lobbyists control their votes and corporations fund thier campaigns. Though some politicians have honorable intentions (your team!), there is always some check or balance in government that prevents them from accompishing meaningful legislation (damn other team!)
Evil: A shadow government, or a concealed third-party (think the Emperor from Star Wars), pull strings from behind the scenes. Disallowing any important issues from seeing any kind of resolution to keep the people divided and bickering. The only legislation or major policy decisions that come to light are ones that serve its intentions (Oil, Money Power). Having control over all major banks and corporations (news media, food, military industrial complex, music, hollywood etc.) , they sculpt society as they see fit and even control the government through the guise of lobbyists and special interest groups.
The first seems much more rational but I challenge people to consider if the second option is truly impossible? Couldn't it be true? What wouldn't be possible with unlimited money?