Incidentally, I think that a major problem for horror films these days is that we have a culture obsessed with intentionality; that is, the inner psychology of people who do objectively evil things. This is good for several genres, but it is poison for horror as it was done in the 20th Century by just about anyone by Cronenburg, because they tend to rely on a villain with inhuman or unclear motivations. A)as mentioned, this has been done to death, and "stock" villains have appeared which lead to endless franchising B)Audiences want less of this because they're often interested in "believable" villains (and villains whose motivations you understand just aren't horror villains in the same way) C)If you genuinely took a controversial issue and presented it as horror, you'd be seen as being unsympathetic and superficial with the "villains", and disliked for it (Imagine a Raoul Moat Horror movie). Hence the popularity of zombies, who are mindless, and the predictably senseless killing machines which are both clichéd and lack any sort of contemporary verisimilitude.
Essentially, horror needs a dramatic kick of originality up its arse, not critics to consider the execution of a plot alone, if you ask me.