Why did abolitionist believe that Lincoln should make the end of slavery a goal of the war?

Abolitionists believed that making the end of slavery a goal of the Civil War would not only align the war effort with moral principles but also undermine the Confederacy's economic and social foundation, which relied heavily on slave labor. They argued that emancipation would weaken the South's ability to fight and rally support for the Union cause. Furthermore, abolitionists saw it as a pivotal opportunity to promote human rights and justice, ultimately transforming the nation towards a more equitable society. Emancipation was viewed as essential for achieving true unity and freedom in America.