It seems to me that most of the fictional monsters and villains we meet through books, films and TV these days are generally created in a way that we can understand their crimes or brutal approach. For instance, in the novel, The Warm Bodies (and subsequent film) by Isaac Marion, we find a zombie who grows tired of his life of noshing human flesh and seeks something more, well, human. He wants to fall in love and have experiences beyond his condition.
In Dexter, the character of the title is a serial killer who appears to take delight in his gruesome murders but only slaughters criminals who have escaped justice.
Time and again, the actions of fictional monsters and villains can be explained away but what happened to having a baddie who was just bad? I miss that.
We need more thoroughly evil characters like Freddie Krueger, the Hitcher, the Candyman and Pennywise from Stephen King's It. I don't want to sympathise with a monster or a villain. I want them to scare me and endanger the characters I'm rooting for.
What about you? Do you like to understand the monster or would you rather be scared witless by an unrelenting villain?