Davis was perhaps one of the most opportunistic and evil men of the Civil War, who functionally preyed upon the "nationalism" of others in the South for their own power... and then when defeated spent decades writing and rewriting history in order to paint himself as the hero and others as villains. Davis was a foundational intellect of Lost Cause Histography, and, something a lot of modern people forget, is that the initial wave of Lost Causers actually tended to DEMONIZE Robert E. Lee (since, yanno, he ended up losing the war and surrendering) while holding up as heroes figures like Jubal Early, Bedford Forest, and Thomas Jackson (who likely would have hated being lionized by these people).
Lee's lionization came not from the Lost Causers, but from the military and veterans not just those who fought under him, but also those who fought AGIANST him. There was good political reasons for this too, firstly Lee pushed for peaceful reconciliation between the North and South and lived the few years after the war exility in that way, despite the
Federal government fucking him over because the Secretary of State wanted to give a friend a memento. Secondly, Lee had always been more skeptical of secession and thus made, in some respects, a perfect hero for the South to hold to in the Civil War. A man loyal to his State which had gone astray and fought brilliantly to the end but was also gracious in defeat (it helped that Lee WAS actually a good general whom had pulled multiple victories out over bad odds to the point where his maneuvers were studied for generations after, and that he had won the respect of those who served under him to the point where he had a strong degree of personal loyalty from his troops... and finally that even in surrender he had advocated for them to Grant, whom had respected those requests from Lee, Grant's terms of surrender to Lee were actually quite generous to the troops and not, as he was famous for "unconditional").
Basically Davis is scum, and I wish people focused on hating him more than Lee...