B) Lenient
He didn't want to be so harsh, and knew they only were being mislead from the rich people making free labor off the slaves. Most of the confederates fighting hardly had slaves and barely shared any "racist pride". So Lincoln was Lenient.
It protects someone from being compelled to be o witness against himself in a criminal case
The sudden end to the slave economy would have had a profound and killing economic impact in the South where reliance on slave labor was the foundation of their economy
war and immigrant rights because if immigrating american or where ever are treated inhumanly that is wrong and war because we dont want some one to get too powerful like Hitler