I'm from northeast Ohio and have always lived here, so I am from the north. Slavery was not a reason that Lincoln decided to go to war, he had no problem with slavery and even supported an amendment to the Constitution that would have made slavery permanent where it already existed. Sherman's march through the south was not a "few rogue soldiers." They were sent by Lincoln, and given the thanks of the nation from Lincoln for burning southern cities to the ground, murdering innocent civilians and slaves, and raping southern women.
My sources are:
The Real Lincoln by Thomas J. DiLorenzo
Lincoln Unmasked by Thomas J. DiLorenzo
War Crimes Against Southern Civilians by Walter Brian Cisco
King Lincoln Archive
That's a huge archive of Lincoln articles that may tickle your fancy.
As for most of Lincoln's crimes, you don't have to search very hard for them. Most people know that he suspended Constitutional rights in the north, was a racist who wanted to send black people out of the country, committed war crimes against southern civilians and slaves. They simply rationalize them away, because, after all, it's Father Abraham.