For whatever reason, the acting business seems to attract people who are liberal. Their personalities, impulses, abilities to play make believe on camera, etc., which allow them to make a living as entertainers, also give them liberal world views, which translate into Hollywood activists almost always supporting the liberal side of issues.
Have you heard of anyone in Hollywood who opposes same-sex marriage, for example? Is anyone there pro-life? Is anyone there opposed to the global warming agenda?
I’m no therapist, but, I would believe that certain personality types, with a desire to be “tolerant” of anything, gravitate to the entertainment business. And then, once there, some of them want to use their celebrity to push causes, which are liberal because they are liberal.
You can include the music business for the most part , too .
Have you ever noticed how many actors are left handed?
Actors want to play the widest range of roles possible. To effectively portray these characters, they need to get into the characters' minds. It is possible that in that process, many end up being captured by their roles, such that the distinction between good and evil becomes blurred.