Perhaps I don’t fully grasp Total Depravity since as I understand it, the logical consequence is necessarily that God is only different than Satan (or unpersonified evil) and greatness is only measured in terms of power; which has no bearing on the morality of either God or Satan.
Holding to Total Depravity as the natural state of man, no one has a vocabulary to speak to either the goodness of God or the harrow of evil. Man is left to only describe God and evil in terms of what men prefer and this preference — again because he has no connection to the good at all, being totally depraved — has no other objective point of reference. And while this doesn’t present any problems whatever in discussing human ethics, it certainly does mean by definition that our ethics have nothing to do with God. That’s quite a departure from scripture.
Scripturally and logically, our understanding of what is good is because there is goodness in creation itself and that all are drawn to participate in it in as much as any creature is able. That presence being grace and the draw to it being “pistis”, persuasion, faith. This is seemingly the natural state of man; inclined to the good because however dark the glass, it still reflects the image before it, namely goodness aside from man and that man desires as its icon.
Just a thought.