Why did Lincoln want it to be easy for the southern states to rejoin the union?

The simplest answer is he wanted the end of slavery he wanted the end of Civil War and he wanted to unite people. I just finished a essay on Lincoln he had strong belief in ending the injustices done to slaves. He was about 19 when he saw his first slave market sale and in our words today it turned his stomach. He was repulsed.He believed the slaves Constutional rights were being denied.