Interesting statement, considering virtually every member of the Davis regime were slave owners. And if the statistics can be found, I would wager that the majority of confederate representatives and governors and legislators were slave owners as well.
Slave ownership is not political leadership.
Slave owners could be politicians, and politicians could be slave owners, but the map is not one to one and onto. Tyrant carries a political connotation.
But as always, feel free to jump in whenever and divert the conversation as you please.