The type of error one commits when answering a question like this is sometimes called a 'fencepost error' because one has to be careful to distinguish between the upright fence posts and the rails between them. I have a nearly useless blog post about fencepost errors, frames and motion blur (useful mainly for starting arguments between animators on a Friday night.) http://www.digitalartform.com/archives/2005/06/motion_blur.html
Plus you can visit all sorts of mayhem upon them relatively guilt-free. You are not even killing them; they are already dead. And along with other creatures of the supernatural, as well as robots, aliens and Nazis, you can fight them without alienating large segments of your audience.
I made this American Cinematographer cover 20 years ago to illustrate the then relatively new concept of digital compositing and filmmaking. After the issue came out I got a call from an A-list director inquiring the availability of the stage . http://www.digitalartform.com/archives/2005/07/american_cinema.html
http://www.dsm.fordham.edu/~moniot/Opinions/fencepost-error-history.shtml
http://www.digitalartform.com/archives/2005/06/motion_blur.html
http://www.slate.com/blogs/xx_factor/2013/03/28/guys_who_do_housework_get_less_sex.html
http://www.digitalartform.com/archives/2005/07/american_cinema.html