Naturally, Lincoln must be judged by such types as a racial extremist while still being a racist garbagebag.
There are many arguments against Lincoln beyond being racist segregationist who did not believe in the equality of blacks and whites (which many people were in those days) like suspending habeas corpus, violently quelling dissent, instituting an income tax, forcing people to accept money not backed by gold or silver, denying medical relief to the enemies, and letting his generals conduct total war against civilians.
Just because Jefferson Davis and the Confederates were OK with many of these same things plus chattel slavery does not make it acceptable that Lincoln did them - even in war. Just because Forrest and other Confederate generals butchered surrendering Negro troops did not give the OK for similar atrocities committed under Sherman and Sheridan.
Famously Lincoln & General Grant greenlighted Sherman's destructive tactics focused on civilian infrastructure that have both earned praise from military strategists as well as sanction from many Southerners. While directives expressly forbade attacking civilians rape and murders did occur.
https://opinionator.blogs.nytimes.com/2013/04/25/rape-and-justice-in-the-civil-war/This is a chapter in the Civil War that has a lot of controversy of course but at the same time the lack of multi-dimensional studies on both Union & Confederate aggression against civilians is something that should be addressed in the historical record aside.