Hence the term 'paraphrase' and it's obvious you have never read A Christmas Carol
I suppose it's because you didn't much care for what Dickens actually said on the matter, and of course I will remind you again that Dickens was very much anti-slavery, but could still see the truth of the situation.
Based on his single visit to the states he's what passes as an expert on the U.S. in your world. And as you are want to do, you take his opinions and treat them as fact.