I should have also pointed out that, if the axe-grinders were really all that interested in the subject of joint ownership of slaves, they could also look into the very real issue of corporate ownership which was, unlike “family ownership” a genuine legal object of study. They probably won’t like where it leads, though.
Like all pro-Confederates, you totally misunderstand the northern mind-set.
You fantasize that northerners wish to blame the South and exonerate the North of all wrong-doing.
You imagine that's how we justify invading and largely destroying the ante-bellum Southern "way of life".
Nothing could be more mistaken.
In fact, the Union -- for whatever its sins and wrongdoings -- invaded the Confederacy only after the Confederacy first provoked, started and formally declared war on the United States, on May 6, 1861.
Freeing the slaves came later.
Even "restoring the Union" was not President Lincoln's original goal in April 1861.
At that point all he wanted to do was maintain Federal ownership of various properties, i.e., Fort Sumter.
Point is: Civil War came because the Confederacy started it.
Only then did the Union determine to finish it, properly.