US Authoritarianism

that doesn’t lessen the evil of conservatives owning other human

Nobody is disputing that. The thought is that comparing the plantation itself as a conduit of slavery is dishonest, as a plantation's primary function was harvesting cotton or rice. That could be, and very much was, done by wage laborers and not exclusively slaves.

The sole purpose of concentration camps was the extermination of undesirable demographics.

It's dishonest to compare them as the original post did.