Riker's arguments revolved around giving weight to Maddux's argument that they only saw him as a person because he looked like one. Demonstrating that if he were a talking metal box instead of human shaped nobody would even consider he had rights.
It's easy as the audience not to question the idea that Data is sentient and see Maddux as an AI-bigot, but if a 'Data' was invented tomorrow, I think 80% of the population would not only not believe it, they'd assume he was a threat to their safety.
Picard's final argument was basically "Yeah, I can't prove he's sentient the way we are. But if he is, do you really want to be the jackass in the history books who started slavery again?"
I'm not sure I'd call the androids we see in Picard slaves. It was made pretty clear that they had not re-achieved android sentience yet. Not intentionally at least, they accidentally did it a dozen times.
It's easy as the audience not to question the idea that Data is sentient and see Maddux as an AI-bigot, but if a 'Data' was invented tomorrow, I think 80% of the population would not only not believe it, they'd assume he was a threat to their safety.
Picard's final argument was basically "Yeah, I can't prove he's sentient the way we are. But if he is, do you really want to be the jackass in the history books who started slavery again?"
I'm not sure I'd call the androids we see in Picard slaves. It was made pretty clear that they had not re-achieved android sentience yet. Not intentionally at least, they accidentally did it a dozen times.