Why do republicans have this idea in their head that if democrats get away with a fictional crime then they should not be held accountable at all?

Anonymous

For example if Trump is being held accountable for keeping confidential documents they always bring up hillary's email's or hunter biden's laptop. Then if trump is being accused of working with the russians, then they bring up something from hillary's past. Or if they are being tried for sedition and treason for Jan 6th then "what about black lives matter."

Why do republicans have this idea in their head that if democrats get away with a fictional crime then they should not be held accountable at all?
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