Morbid dolls

I think people have been fascinated by death for centuries. And it's everywhere - dolls, movies, music videos, litterature... I started thinking about it because I found a seller on Etsy that made Victorian boudair dolls that had skeleton heads. Why do people find it so fascinating? Skulls have turned up in so many different places, and they always represent something forbidden - and humans love forbidden things...

Not many can have missed the romantisation of vampires for example - Anne Rice being a good example of this - and zombies are so popular they have more or less become standard in horror games and movies. If you want to make something frightening - use death, whether in the form of zombies (Dawn of the Dead, Living Dead and I am Legend for example) or vampires or even necromancers.
Everyone that reads fantasy have encountered them in some form.

Then there is the Goth style. Skulls as decoration, dark colours - most popular being black and bloody red. Even Lolita have this style, called 'Gothic Lolita'. All the rules that come with Lolita applies to Gothic Lolita as well, so some popular elements that exist in Goth (such as net stockings and revealing corsets and cleavages) don't exist in Gothic Lolita. But even so... Zombie dolls or otherwise morbid dolls are very common. Wallets shaped like coffins and gothic crosses.
For example, there's the Living Dead Dolls

or torn and battered stuffed toys with visible stitches and often bandages or button-eyes.

I can, somehow, understand why it is so popular. Death in itself is a very frightening thing, and still...people are drawn to it. I imagine it is a sort of thrill, not unrelated to the thrill of doing something that's forbidden. And there seems to be no clear line where it goes into something that's not acceptable - each on his or hers own tolerance. Anyone who has seen - like I have - Braindead by Peter Jackson know what I mean. We all have different tolerance level.
What's fun? What's scary? What is simply too much?

It seems when it comes to art statements, pretty much anything goes. And isn't that what is so wonderful about art?