So I am sure if you ask each of those people you named they'll deny that there isn't any racism in the Hollywood business right? LoL
Ignoring your erroneous double negative, let's stipulate Hollywood has been liberal at times on race.
First and foremost, it's a business. It's affected by the society and audience demand.
If it had made 'The Honymooners' or 'The Brady Bunch' with black families, they would have bombed. It has been racist at times, meeting market demand.
But let's look at when it stuck its liberal nose into the race issue, looking at a couple examples.
Sidney Poitier movies took on race issues - a white daughter bringing home a black man as her romantic dinner partner to her parents. That was widely uncomfortable and opposed for white America at the time, pretty daring - by showing the discomfort, looking at the issue, they helped America progress on the issue.
His character Mr. Tibbs - it wasn't that long after freedom riders had had their busses burned and been beaten traveling the south that Mr. Tibbs shoved race into the face of a southern white sheriff, again exploring what was pretty daring at the time, the very real racism in the south.
Or, take the television series 'Roots' that was a big national event, exploring the history of slavery new to many whites.
Of course, they made the other side too, remember those major movies advocating for the KKK, the racist side of things? Me neither.
So, ya, Hollywood has sometimes been liberal on race - and it's a very good thing.
Funny thing is, nearly everything you might call 'progress' in the last country was a 'liberal' movement.
Right of women to vote, giving workers more power to get more rights and better wages and creating a strong middle class, the civil rights movement, more equal rights for women and protection from sexual harassment (what do you mean, a husband can rape his wife? He has a right), environmentalism, consumer safety, support for freedom over colonialism and dictators we back, and many more.
So, there's a big overlap between Hollywood supporting 'progress' and a 'liberal' position.
It's had a share of some right-wing content too, though - John Wayne the US military hero (in the movies, the person evaded WWII service), the movie 'Patton', in fact there are quite a few movies glamorizing war and war heroes. It's had a good number of stars on the right - I remember a certain disastrous President who used his General Electric corporate spokesman skills well to sell war, I remember a charismatic actor who used his charisma for championing the NRA as its leader, and many more.
In short, ok too late for that, the real objection to the right is not 'bias', but the petulant whining of their ideology not getting its way. If they wanted 'balance', we'd hear more concern from them about talk radio being 90% far right - but they cheer that, switching their standard away from opposing 'bias', to saying 'that's fine, it's the market'. They would have screamed against the 'social activism' of Sidney Poitier at the time, and they scream against the 'social activism' of "An inconvenient truth" today.
They're wrong and simplistic to describe Hollywood as a monolith about liberalism; it's a business, that is sometimes liberal in its movies, helping progress America.
They don't oppose them as fellow Americans they don't agree with, they demonize them as some 'enemy' as the wild-eyed ideologues they are.
Hollywood doesn't always get it right; sometimes it takes a wrong side, does misrepresent an issue. That's art, that's politics. They don't have to always get it right to not be some 'enemy of the country' needing to be 'purged' - excuse me, re-purged after the last time the right got its way, when Hollywood did purge its liberals in the McCarthy era blacklists. Gee, I can't imagine why Hollywood would not be right-wing.
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