I don't get why there's so much fuss about content warnings being seen almost an" admission of guilt" nowadays, as
Haiz and
thorny already said, when that horribly vague 'Viewer discretion is advised' warning has been around since the 90s. And I say that even when I am kinda neutral when it comes to content warnings because on one hand they can be pretty useful, but on the other they can spoil the story if you're not triggered by them. I don't want to come across as disrespectful to those who need them, so I'd like to present you with two examples to better illustrate what I'm saying, hiding the reasons why there is/there is not a content warning behind each mini-spoiler.
I like to read the webcomic Lore Olympus. It's a modern take on the Persephone & Hades relationship. It sometimes uses a foreword, a succinct warning in a 'be careful,
hic sunt dracones' kind of way that goes straight to the point.
It can be dark, and sometimes it deals with heavy stuff (raping among others).
The other example is the anime Made in Abyss, based on a manga of the same name I didn't know existed. So there I was, watching what seemed to be a lovely girl that lives in a Ghibli-ish world, who goes on an adventure trying to decipher what's going on at the bottom of said abyss, accompanied by her friend, a cute robot boy.
And as soon as they go deeper, it all goes south, gore-fest style. It's a stark contrast, and can be frankly uncomfortable to watch.
So I think the author of Lore Olympus is in the right by putting those content warnings when needed even though the story flowed there naturally, and I think Made in Abyss would lose its impact by having one.
You could think that Made in Abyss and Lovely People are similar in a way, as both of them hide their true nature to shock their audiences, but at least trailers for MiA weren't misguiding (I don't watch trailers as they usually spoil the climax*), and its international certifications give straight away that something is amiss in that Arcadian world.
'In the abyss, there is nothing as impartial as death' is the first sentence of the English dub trailer, and the non narrated Japanese one, while spoiler free, shows lots and lots of red flags about the real content, including a short shot of a fly-ridden rotten corpse.
What did we get for LP beforehand? An almost throwaway mention of religion, as if a background filling/secondary theme (which even with my background I'm not against by default). People shocked and disgruntled by MiA (a friend of mine, for instance) had extra info available beforehand (certifications, trailers, spoiler-free reviews), LP had none. Even more so, LP cannot be considered in a vacuum, it is engrained in Minna's work –so much so as to be placed by her as an appendix to SSSS–, a work which had had nothing to do with LP themes till then. I've come to think LP does not need a content warning as much as it needs an honest summary, or at least that she had made extra content available that would give away its true intention even if subtly.
BTW, I am not –I AM NOT– comparing MiA and LP themes themselves, but their 'let's hide our real themes to shock' approach, trying to make sense of why LP feels so deceitful to the reader. In one case, I was blindsided because I wanted to, I chose to. And that's not LP.
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* Edited out certain movie based on a certain book based on a certain author whom I’ve since found out is a homophobic pile of bull… droppings.