I'm confused by your addition of "and don't know their rights". In at-will, not knowing their rights means they get fired with no notice because that's allowed.

I'm confused by your addition of "and don't know their rights". In at-will, not knowing their rights means they get fired with no notice because that's allowed. Without at-will, not knowing their rights means they potentially get fired with no notice because they don't know it's not allowed. I would think that giving people more rights is more helpful when they do know their rights.