I know that, I was making an analogy, if you think it irrelevant than feel free to ignore. My point being that slavery is an evil industry, but I can think of a scenario that involves a person buying a slave for noble motives, if I were to follow a similar moral reasoning to you, even buying a slave for the express purpose of freeing them, would be immoral.
Indeed, even a slave saving up money to buy his own freedom would be evil, because “The entire industry is evil. We can’t contribute to that in any way shape or form.”
Again if you find the analogy irrelevant than so be it, but hopefully some others reading this find it helpful.