I've written about some really nasty bastards over the years - people and monsters (sometimes both) who either think they're misunderstood or don't give a toss about being the bad guy, who embrace it. Every time one of these characters comes to the page, I try to ground them in some degree of reality no matter how small. After all, there is nothing more frightening than reality. All you have do to see that is watch the news for about five seconds.
At the same time, there are the good guys: people who are put into that position simply because they don't want to get killed or maybe because they want to stop the bad guys from their moustache twirling, cackling, tying women to train tracks ways (depends on the story, obviously).
It's the same in the real world as it is in fiction. My first reaction upon hearing about a robbery at a local cat charity that resulted in all the food being stolen and leaving the charity with literally nothing to feed their cats was something along the lines of what kind of fucking bastard piece of shit would do that isn't there any honour among thieves and then I saw the comments on the charity's Facebook page: people offering anything they could from a few quid to more cash to dropping off donations of food to blitzing the charity's Amazon wishlist.
The good guys, in short.
So, if you want to be one of the good guys and you've got a bit of cash you can do without, you know what to do.
Cat charity JustGiving page