You are correct that the republic is designed to balance against a tyranny of the majority and for good reason: the rights of minority factions are threatened i

You are correct that the republic is designed to balance against a tyranny of the majority and for good reason: the rights of minority factions are threatened in such a state. >The executive branch has so much power that it is in fact a monarchic republic That is not true. The executive does not hold power for life, rule is not hereditary. Also, the executive branch is not a republic. What would that even mean? The executive branch is more like a dictatorship within government that is held accountable by congress, the judiciary, and the people. And the executive is ultimately held accountable by the people via the election of representatives. To your point that democratic republics fight popular movements such as the protesting of slavery, every state has the capability to do bad. This is not surprising in the least. This is about as surprising as saying ‘humans are capable of doing bad’. The good news to my mind is that the democratic republic is the least bad option and has performed fairly well over time in response to changing social mores.