I was thinking about how these freaks tend to be shitty writer and came up with some explanations. Sorry for making it TL;DR
-Their stories tend to be more simplistic, bland and less creative because they refuse to write anything that can violate their ideology as they are pathologically obsessive with it due to extremism. Diversity hire bullshit which includes extremist staff pandering was also suggested as a reason due to the poor staff quality that results from this practice.
-They love shoving their extremist ideology into everything, which is why several of their stories contain negative depictions of whites and men, with the nature of said depictions being comparable to a neo-nazi's depiction of Jews. They also tend to be full of other themes designed to pander to their kind as well as references to their conspiracy theories that are depicted as if they are all true. An example of this would be the infamous Mafia III, which contains several instances of regressive leftist themes and a reference to the regressive left's "alt-right" conspiracy theory in the form of a Klan like org known as the southern union, which it's leader denies on their radio show.
-They're prone to making Mary Sues and turning preexisting characters into them like in the case of Marvel character Carol Danvers, which was so disastrous that people now mix up the character's name with the joke nickname Carl Manvers. This is because they think that depicting a character who's supposed to be "diverse" with any real flaws violates their ideology, and they have responded to the criticism of their characters being Mary Sues by declaring the term to be hate speech.
-Their pathological extremism often distracts them from proper writing, resulting in writing issues such as the fact that it was never really explained how in the sequel trilogy that some imperial warlord in the outer rim was able to successfully build a massive planet integrated death star successor that is powerful enough to obliterate multiple planets rather than something more realistically powerful lore-wise for their factions size, and intimidate at least half the galaxy into surrendering to their rule while somehow being able to establish and keep that rule when said superweapon got destroyed in a small time frame after it's first firing.
If there are any other notable issues or corrections you may have then feel free to suggest them
PS: I think it would be funny if someone turned against the regressive left because they got falsely declared a troll and wrongfully banned from some community for calling Carol Danvers Carl Manvers by mistake, just because of the joke nickname's popularity among the anti-regressive movement.
The simplest, most all-encompassing answer you can give to the question is that it's because **they are all, practically without exception, conciously, deliberately, explicitly setting out from the get-go to write political propaganda for their ideology. ** ANY writer that does this, regardless of what their ideology is, is going to write kooky bullshit that is divorced from reality, slanted, and generally unrelatable to the unindoctrinated.
To quote King of the Hill: 'Can't you see you're not making christianity better? You're just making rock and roll worse!"
'B-but Harry Potter was successful!', Someone might say.
Harry Potter is not a 'left wing' narrative. Harry Potter is 'school kids beat hitler' - a story that would appeal to almost any westerner born after 1945. J K Rowling wasn't sitting there surrounded by books about Marxist theory when she wrote it. She hadn't marinated her brain in leftist talking points beyond the casual media landscape of the day. She wrote Star Wars with kid wizards at school. She did not write a political diatribe disguised as a story. She wrote a completely milquetoast 'hitler was bad' story, as a person who had grown up in post-war Britain. That leftists latched onto it so heavily says more about leftists that it does about her. As does their about-face the second she had the gall to admit that she doesn't believe biological males can ever be 'real women'.