Because it’s not practical to accuse everyone lying of purgury. Literally every politician lies on a daily basis to earn a living. Most are white lies. They tell their Boss his/her idea is a good idea so they’re not fired for honesty, or telling the public the theory behind some new legislation as if that’s the actual result, so the public doesn’t riot, resulting in their boss firing them.
Putting every politician under oath would mean having a leash on every politician that is held, not by a single entity that can perceive and understand the lies they tell, but by the court of public opinion. That court is so cultivated by politicians to arm against their enemies, that such an act would mean a million knives at the throat of every man, woman, and(if current legal policy is any indication) child that happens to be in their way, or disagree with them, or any number of minor infractions.
Most politicians understand this on some level, and refuse the unilateral application of the Oath because it will become that knife, and be held against everyone by everyone.
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