Trigger warnings are unnecessary. There's a reason why some movies are rated R, and that TV shows have their parental guidelines rating on the top of the screen at the beginning. It's the best "trigger warning" that they could provide, warning their viewers that it may contain mature content.
MPAA ratings are useless, and if anything TV ratings are even worse.
It's true that a lot of people don't pay attention to the MPAA ratings, so why would they care so much about a trigger warning? It's still the same idea - a warning that the movie has violent or controversial content. Most people will ignore it.
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