I'm not entirely sure your point?
Yes, fiction is fiction. Fiction fictionalises real life.
But no one makes comedies about rape; that's in bad taste. There's topics that need to be handled with deftness. The Virgin Suicides highlighted the absurdity of suicide; Madame Bovary was about existential crises; the Sorrows of young werther is about obsession.
13 Reasons Why is about, at least partly, about revenge. That's a serious no no. It's like making a rape story where you blame the victim.
Look, it's not a bad show - but it is potentially damaging. Every psychologist alive agrees with me too, evidently.
I'm not saying these things are taboo - great tv and stories have been made about them. But, if that's the topic you're making your narrative about, you need to demonstrate understanding of what it means.