While triggers are primarily a fanfic problem, there are some for original fiction as well. Politics is a huge one. Generally, people are willing to accept that people behave according to different political views. But if the author starts running interference, erecting strawmen for the main character to fight, then a certain section of the audience is going to cry foul.
The problem is generally when the story proposes to take sides. And even if the story takes sides, things are made worse when one side is treated unfairly. Unless that side is an Acceptable Target, even fair minded people who agree with that side may call it out.
This means the author needs to be able torecognize the difference between the Strawman version of an argument and thereal thing. If she can't, then she probably shouldn't be getting this political in her work, unless of course, the work is intended primarily to promote that political view point and will be sold primarily to that audience.
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