Earlier quoted context omitted.
> I think almost every vice would be less damaging to society if it was in the open. Polite society doesn't want to see sex work or drugs, but they still exist. Hiding them makes things much worse for the people directly involved. I understand what you're saying. However, compare sex work to slavery (which it often is). Nobody wants to be a slave. Some desperate people might agree to be enslaved to pay off a debt. Yo…
By saying that a person can't voluntarily agree to become a slave, you are saying that you, not they, have the right to determine what happens to them. That is the essence of slavery right there. By taking away their choice you are claiming ownership over them. You haven't eliminated slavery at all; you've just assumed the role of slave-owner yourself "for their own good", much as other slave owners throughout histor…
I think you're being hyperbolic.
It is not possible for all people to have all freedoms. My freedom to go where I want is limited by your freedom to decide who comes on your property. Like it or not, we have to collectively draw boundaries that restrict some freedoms in order to preserve others.
Some of these tradeoffs are tricky. This one isn't. If large numbers of people start protesting their inability to become slaves, I'll reconsider. Meanwhile, large numbers of people are currently being forced into slavery - 20.9 million, by one estimate. https://www.endslaverynow.org/learn/slavery-today
Restricting the rights of some small number of hypothetical would-be slaves in order to protect the rights of large numbers of real people in forced bondage is clearly a worthwhile tradeoff.