On Thu, 1 Feb 2018 18:57:18 -0800 (PST), Quadibloc
wrote:
No. Human rights and legal rights are two different things.

Otherwise, we would have no way of saying that slavery was wrong
then, no way of saying why it would be a bad idea to reintroduce
it now.

Today slavery is illegal, in all countries of the world. That's one
reason why it would be a bad idea to keep slaves.

But you do have a point: from where do we get the idea about how to
change the laws?

In science there is a similar problem: how do we decide what to
investigate scientifically? We don't have resources to investigate
everything.