Since conservatives are usually better at business than liberals, it is no surprise that Hollywood conservatives are quiet about their views, beyond contributions and occaisional appearances at conventions, AND that they are not as "in your face" about their beliefs, or as shrill, for that matter.
Or, it could be that they have some class.
In any case, the old studio system, which has taken many slings and arrows over the years, did its job quite well...it produced wonderful, uplifting, patriotic entertainment for 50 years, and did so with much less money, fuss, and rancor than the insane bedlam which replaced it.