Not sure what you mean here. I think any sane human today can understand slavery in any form is morally wrong and shouldnt be politically or socially acceptable. He wasn't ahead of abolitionists. His stance on slavery could be considered meek and feckless at best.
His stance was shared by many segregationists and southern political leaders.
It seems he is in their crosshairs precisely becasue he wasnt vociferously and actively undermining the institution of slavery. I dont agree with their canceling but Im just offering some points of contention to discuss.
Also, slavery began to be outlawed in norther states as early as 1800s. SO no... I dont think he was a head of the times at all. He was politically pragmatic and in a terrible position of having to hold a country together being split over something he felt he had no right to interfere in.
I understand the points. I think many are overly harsh using today's lens. Here are my thoughts..
1) He was a politician, and he wasn't likely to rise, or rally the masses if he was John Brown like.
2) Lincoln's election was a trigger for secession. Lincoln rejected the Crittenden Compromise but was open to the Corwin Amendment to keep the country together. At the end of the day though, he went to war over the issue. Is that not being on the right side, or ahead of the times. Leading the country into war itself is being ahead of times, and being on the right side. The creative logic it takes to argue against that is head scratching.
3) There were plenty in the North that were fine with slavery, and plenty in the South against. Folks want to paint the North as 100% anti slavery, and the South 100% for slavery. It's just not factual. Truth is, the country was divided, but the South was just home to more slavery dependent labor. Brother literally fighting brothers in some areas had nothing to do with slavery, but more a way of life and states rights, or anti federal sentiment. Lincoln IMO, understood this, as part of the times, while also understanding the biggest source of secession "politically" was slavery. He did his best to hold together the country while not turning brother vs brother, but at minimum outlaw expansion hoping time would catch up. Didn't work, so he went to war.
4) How the cancel folks can attack Lincoln, who lived in very muddy times, for going to war over the issue, and yet not cancel MLK who was obviously a misogynist, and likely much worse, in times that were far more woke than Lincolns is just pure hypocrisy.