When you won't read a book because the cover is too scary

When I published the first two books in the After Z-Day series, one of my considerations was how the book covers should look. I wanted to convey the genre of the series (zombie apocalypse) in an immediate and obvious way, but I also didn't want covers that were too scary for someone who isn't a fan of zombies to be afraid to pick them up. 

The reason why that's important to me is that there are books I won't read because I'm too scared of the cover. For example, one of upcoming books that I'm see...