“...make a valid argument on a site called “Free Republic” that slavery is acceptable...”
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“Is” acceptable or “was” acceptable?
“Acceptable”?
Acceptable to whom?
The federal government?
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“...its continuance should have been tolerated...”
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Tolerated?
Tolerated by whom?
People, and the governments they create, “tolerate” a lot of things; and lots of things change with time.
((What is “moral”? What is “legal”? What is “acceptable”? What is “tolerated”?))
Take a snapshot of what people “tolerate” and “accept” at one point in time
and compare it to a snapshot of “toleration” and “acceptance” at another point in time
then attempt to understand the morality and character of those in the snapshot.
You can do this over and over again all through out the history of man.
Lincoln did with cannon and gun what he could never have accomplished through legislation.
He personally seized upon an opportunity to force his personal view of what was “moral” and “acceptable” to end a “legal” practice,
and he did so at the cost of 600,000 lives.
Actually he never got the chance to accomplish the abolition of slavery through legislation.
The South seceded before he could try to.