Imagine doing this analysis on the effects of requiring a business to pay it's slaves, and coming to the conclusion that some slave-based businesses would have to close, since their business model was so skewed, it could only function with slave labor...
Who cares! We don't want a world with companies that can only work with those kinds of business models!
Slave labor shouldn't subsidize artificially low priced products and artificially inflated executive salaries... the end.
I mean, that's fine, if you think that you can consider all conceivable angles thoroughly, by yourself. I for one welcome opposing views, but I suppose if my idea of that meant "religion or conspiracy theories" I'd probably be avoiding it too.