Analysis / Darkness-Induced Audience Apathy

Some possible causes of Darkness-Induced Audience Apathy:

Movies and TV shows with Diabolus ex Machina and Kill 'em All Downer Endings can have this effect for cynical viewers, since it means that all hope for the characters is lost when they were doomed to their fates.

Even shows where the heroes win a Pyrrhic Victory can devolve into this, especially if the heroes are whiny, ineffective or too slow to act. Sure the villain gets defeated at the end, but his death seems small compensation for all of the havoc and death he caused. And if the villain corrupted the heroes or turned them against their ideals during the course of the story, the heroes' victory seems even MORE meaningless.

Works that use Joker Immunity and Cardboard Prison heavily can often fall into this. This is especially the case if every time the villain comes back from the dead/ breaks out of jail he kills people. It can make it seem like the hero isn't really making a difference and that the villains will never truly be brought to justice.

Throwing in controversial scenes or topics such as rape (either for comedic or dramatic purposes), Cold-Blooded Torture, discrimination (even on the fictional races), genocide, or any form of Fate Worse Than Death can also invoke this trope; particularly if the said scenes or topics were executed poorly or cause a lot of Unfortunate Implications.

Abusing the Humans Are Bastards trope too much can easily result in Darkness-Induced Audience Apathy. Aside from the tendency of being overbearing, the end result is just another kind of Evil Versus Evil, and at that without any differentiation between them (since, well, all of those sides act as humans). Even variants with a few sympathetic characters can fall into the trap of making their failure on account of being good a Foregone Conclusion.

In general, Darkness-Induced Audience Apathy was a common criticism with the '90s Anti-Hero craze back in The Dark Age of Comic Books. Many of these "heroes" (particularly the ones from independent publishers) were so evil that it was hard, if not impossible, to care whether they would come out of their adventures alive.