I worked in a Hollywood production company years ago. It might surprise you how many conservatives there are working there. However, they are generally not open about it, as it could cost them work. I would say Hollywood is 20% conservative, 60% liberal, and 20% wacko : )
I am acquainted with a couple — he’s a cameraman and she’s done stunt work — who are conservatives tied into the Hollywood scene, and they tell me the same thing as you. The Libs and whack-jobs in Hollywood are, for the most part, the ones in FRONT of the cameras. Behind the scenes among the cameramen, gaffers, riggers, grips — the folks that do all the heavy lifting — is where you find most of the conservatives.