Absolutely fucking not. May I remind you that famous people sticking their unqualified noses into politics is where Trump came from?!
Who needs to speaking out are mayors, legislators, judges, heads of big businesses and governmental agencies, heads of unions, etc.
I get it, you see a person on your screen saying something you agree with, and they have a face that you recognize from other times you've seen them on a screen. So you automatically assume they must be worth listening to. They aren't. They are famous for being actors. That's it. They aren't politically savvy, or have some deep insight into the interworkings of our governmental system. Getting political talking points from them is like asking the guy behind the deli counter for medical advice.