When movie and TV people spoke out against Voldemort at the Golden Globes, I am sure there are people who said, "entitled coastal elites" and dismissed them out of hand. But everyone in that room was aware of the McCarthy hearings and the many people in the industry whose lives were destroyed not because they were communists, but because Joe McCarthy had a thing for movie stars and it was a way to make them come to him. And they know that McCarthy's lawyer was Voldemort's mentor.
House UnAmerican Activities Hearings, of course, are a circus. While destroying lives for the fun of it, they pull attention from the other awful things the government slips under the radar of a celebrity-obsessed press.
So those people put themselves on the line, on international TV, knowing all those things. People with huge careers, who maybe can afford to take the hit, drew the fire. People who maybe couldn't afford the hit, but couldn't afford to let things go down unchallenged, drew the fire. Becaue the last time, people let the threat silence them. It appears that this time they will not go down without a fight.