How is Lincolns death a calamity?

Lincoln's death on April 15, 1865, marked a profound calamity for the United States, as it occurred just days after the Civil War's conclusion, leaving the nation without its guiding leader during a critical period of reconciliation and rebuilding. His assassination not only robbed the country of a compassionate and visionary president but also plunged the nation into further turmoil and uncertainty, exacerbating divisions and hindering efforts toward healing. Additionally, Lincoln's death allowed more radical factions to gain influence, potentially derailing his moderate plans for Reconstruction. Overall, his loss represented a significant setback for the nation's unity and progress.