Interesting article.
Coming at this issue from a rather different angle, personally, I think individuals ought to take responsibility for their own triggers. It is perfectly possible to discover if a book, play, film, TV series, etc might prove an issue by researching the matter online. I don't see why others who wish to be shocked by dramatic twists and turns (such as yours truly) should have such things spoilt for us in detailed trigger warnings. It is starting to irritate me a great deal.
And yes - for the record, I have had experiences in my past that could definitely be considered "triggering" in the sense you describe here. In my case, I find the masochistic catharsis of stories that scar comforting and empowering. I like to be ruthlessly terrorised by such stories, as they help me come to terms with my own past (that and lots of extremely dark humour). Not everyone will think that, which I appreciate. Everyone has different personalities and temperaments and respond to such things differently.
I've written about this at some length, in relation to television and films on streaming services (see article below, if you're interested).
Stop Spoiling Films and TV Series in Trigger Warnings | Blow Your Stack (medium.com)