While each job is there to uphold specific tasks based on what its criteria is, it's fine for celebrities or anyone else to raise their voice, awareness, feelings, and thoughts out to the public. It is merely an opinion from said person and not an insult or putdown towards a persons job. Therefore, celebrities should leave politics to the politics but that doesnt mean they cant have a say on behalf of others and their country.
IMO he determines what's right and how people should act in the speech by talking about how dark slavery is and how nobody should be treated like an animal. I hope this helps.
