[Borges]

The % that speak out publically about matters political is actually pretty small.

[TigerLikesRooster]

Not publicly speaking out does not mean that they are not liberals, just that nobody would give them publicity.

There are millions of liberals who do not have a chance to air out their agenda, but are as liberal as or worse than those saying it publicly. Most of them pretty much follow vocal minority. Yes, there are(or used to be) conservatives in Hollywood. They are endangered species, and nobody in Hollywood strongly come out to defend(individually or as a group) them when they are under vicious attack.

Entertainers all over the world tend to be liberals or avowed leftists. It is not an anomaly confined to Hollywood. This may change in the future, but for now that is how it is.