Exactly

In a complex world, one can simultaneously admire Robert E. Lee’s character, J.E.B. Stuart’s generalship, and the courage of those who charged up Little Round Top while damning the institution of slavery.

I don't agree with all the author's thoughts. For instance, the issue of slavery raised sectional differences to the boiling point, but "absent that issue" I believe there were still far too many differences over federalism vs. national consolidation to assume no conflict would have existed.

Still, I'm glad he conceeded the quote above. That's more magnanimous than usual.