Because they are told by others in the industry that they have a duty to share their message to the world since they have a platform to stand on whereby us dirty plebes must listen and be enlightened by their elitist dogma. They are the poster children of everything bourgeois and are just mere tools for the Marxists in their midst.
If the revolution the Marxists have been working toward were to ever happen, many of those actors would be sent to the reeducation camps or the mass graves with the rest of us unless they tow the party line and allow the party to appropriate the majority of their possessions. If only they would see the truth...
This is what they do when the phone stops ringing.
They also are self hating and feel guilty that they have “made it” in Hollywood despite not having the know how of the average blue collar joe, yet making 1,000 times the money the average joe makes.
So they have to spout off about the “oppressed” etc. Just the fact that they have “made it” convinces them that America is truly unjust and full of “privilege”