Left vs. Right

A few questions for everyone:

Why is it that many Christians buy into a package mentality, where decisions on one issue entail positions on other, logically distinct issues, because of a “Left-wing” or “Right-wing” system?

Why is it that people who hold left or right-wing positions on theology tend to gravitate to similar positions in politics and ethics, or vice versa?

Is this a good thing, or should we be trying to buck the trend?