Hypocritical Partisans Pass Political Power

We hear angry complaints from Trump's enemies that he is overstepping his authority, and they are right to say so. They didn't say the same of Obama when he was behaving in many of the same ways, but they did when Bush was President. The same is true of Trump supporters who were outraged at Obama, happy with Bush, angry with Clinton, etc. The problem with this inconsistency should be apparent, if not obvious. But is the problem rooted in the parties, their members, or our secession of authority in the first place?