Your second paragraph does not make the argument you seem to intend. Most other places in the world did not require an incredibly bloody civil war in order to (partially) abolish slavery.

https://en.wikipedia.org/wiki/Timeline_of_abolition_of_slave...

> Those cultures didn’t think slavery was wrong.

Southern antebellum culture was so beyond the pale it not only “didn’t think slavery was wrong,” it thought slavery was so good and so fundamental to its way of life that “mass fratricide,” as you put it, was preferable to abolition.

Previously: https://news.ycombinator.com/item?id=45407005