I certainly hope they do, and not just when it’s fictional. Humanizing them is an important step in stopping the actual real-world harm.
If you recognize that they’re human, then you can understand it’s an issue of rationale and perspective, not Inherent Evil - and you can learn to think like an adversary. This is the first step in developing a good security mindset. That mindset, in turn, is the first tool you need to build functional safety measures and protections for your community.
There’s an added bonus, too - if you recognize that they’re people, you’ll notice that not many people are villains in their own narratives. They aren’t choosing to be evil, they’re rationalizing their harmful choices. And you start asking questions.
If you recognize that cops are people, you learn to ask yourself “Am I being reactionary, authoritarian, and needlessly violent?”
If you recognize that racists are people, you learn to recognize and unpack the racist lessons you were taught.
If you learn that rapists are people, you learn to actively verify consent.
By recognizing that terrible people are not Inherently Bad, but choosing to do terrible things for reasons they think justify them, you get better at protecting yourself from them - and protecting everyone around you from your worst tendencies. It’s a difficult and ongoing process, but it’ll protect you far better than any list of specific Bad Things to watch out for.