"The Eternals" is a great example of how this works. First, it attempted to feature characters of as many different races as possible. Rather than add to the richness and uniqueness of these characters, this decision seemed to do the opposite—they were flat and unmemorable.
... [T]his is the result of too many characters competing for screen time. Even with a nearly three-hour runtime, there is not enough time to develop so many characters sufficiently. Instead of seeing a handful of characters interact with one another, work through internal conflicts, or grow in any meaningful way, you simply have a pageant of individuals showing off their muscles and superpowers against an equally shallow supervillain.
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Another problem with infusing identity politics is the inevitable tokenism, the inclusion of different minorities for the purpose of virtue signaling and nothing else. In one way, tokenism makes too much of identity, assuming race or sexual orientation can make up for an undeveloped, unrealistic character. They are simply included because it's politically correct to do so, nothing more.
"The Eternals" adopts the very worst aspects of tokenism. The main characters fight, and they look good doing it. That's it. Their personal struggles are minimized and their growth is nonexistent. Like Rey from the latest Star Wars trilogy or Captain Marvel, they have nothing to learn because they are awesome already. And if audiences have a problem with this, they better check their privilege and stop being prejudiced.
In addition to the paper-thin characters, the infusion of progressivism also leads to simple, predictable plots. The conflict is always external with some antagonist always trying to destroy or take over the world. The good guys are fighting the bad guys, and nuance is nowhere to be found. The difficult questions of responsibility, freedom, the nature of evil, and even identity are minimized. It's basically the narrative form of "punch a Nazi."
That's why one doesn't even need to watch "The Eternals" to know what will happen. They are superheroes who will fight a supervillain in order to save the world. Why now and not before? Why don't they just take over the world themselves? What makes them good and the other side bad? Where do they come from and what is their purpose? And how do they feel about it? None of this is answered because it would complicate the narrative and challenge simplistic leftist thinking.
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Unfortunately for those movie critics desperately hoping otherwise, the superhero genre is not dead. It can be revived at any time, and probably will be once moviemakers in Hollywood decide they want to make money again. Just as the superhero genre came to the top two decades ago when filmmakers decided to abandon the childish campiness that formerly characterized the genre, it can emerge supreme once again when it abandons the childish leftism infecting it today.