Expediency is the guiding factor in politics.

Expediency : the quality of being convenient and practical despite possibly being improper or immoral; convenience.
Novelty : the quality of being new, original, or unusual.
Short-sightedness : the quality of being short-sighted; inability to see things clearly unless they are relatively close to the eyes.
Unsuitability : the quality of being inappropriate, unsuitable, or unfit.
Inconvenience : the state or fact of being troublesome or difficult with regard to one's personal requirements or comfort.

Antonym of Expediency is Inconvenience