Something I actually just noticed recently was that Lincoln's death was less than a week after the surrender at Appomattox. So recently that the idea that the Confederacy had been "defeated forever" must have seemed far from a concrete truth to its member states. Which made me curious, how was Booth viewed in the CSA in the days and weeks following Lincoln's death? Was he lauded as a savior, or was Andrew Johnson considered by most of the men in power as no better than having Lincoln?
The reaction was mixed. On the one hand there was jubilation both public and private because of what Lincoln represented to the South.
On the other hand there was a lot of fear. Lincoln had been very reconciliation oriented, and it seemed with him in charge the post war would be less harsh. Andrew Johnson was not viewed especially highly given his "traitor" status, and it was believed that the more radical Republicans would use the assassination as a reason to force a much harsher peace.
It's worth keeping in mind the state of the former Confederate states too. The end of the war was not close fought and the death of Lincoln did not change the military reality that led to the CSA to fold.
This article has some good period quotes and citations:
https://www.google.com/amp/s/emergingcivilwar.com/2015/04/15/reactions-to-lincolns-death/amp/