No, it's not, and no it fucking doesn't.
See, this is a really good rubric for discerning whether or not the tumblr post you're reading is written by someone who is full of shit.
If you had ever actually experienced abuse or trauma or rape or any of the myriad of things that tumblrites claim to have been the victims of, you'd know that some fucking fanfiction is not going to make it better. Sure, you can escape for a few hours into a book you love or a tv show or even a good album, but at the end of the day, you will still have to crawl back out from under that security blanket and on some bad days, the very first thought you're gonna think once you've unplugged is, "holy shit, I was raped." And then you have to pull yourself together and function as a human being because there is literally no alternative.
The books and movies and music you love can be great for escapism. But it can't stop if you've the inclination to self harm. It feeds more into mental illness than it helps it because there is an addictive quality to being able to fuck off from your own issues for a while.
That is why not all "coping mechanisms" are healthy. Because it is the opposite of coping. You are not handling your problems, you are running away from them, and you can't do it forever. It'll be far too fucking late by the time these kids figure that out, assuming of course that they aren't just bullshitting for oppression points.