Lincoln defended the process of his Proclamation by letter to Major General McClernand.

1/8/1863 ...to use a coarse, but an expressive figure, broken eggs cannot be mended. I have issued the emancipation proclamation, and I cannot retract it. After the commencement of hostilities I struggled nearly a year and a half to get along with touching the ‘institution'; and when finally I conditionally determined to touch it, I gave a hundred days fair notice of my purpose, to all the States and people, within which time they could have turned it wholly aside, by simply again becoming good citizens of the United States. They chose to disregard it, and I made the peremptory proclamation on what appeared to me to be a military necessity. And being made, it must stand... FT 153