Villains made for older audiences are more often meant to be mirrors, characters in which you can see yourself at your lowest point, be it through shared grief, a shared background, a glimpse of what might have been if you hadn& #39;t left a situation. They not only move a story...
...they are vectors for lessons in empathy and self care that let you see the "dark" inside yourself. It sounds edgy, but take Emet for instance--robbed of his magical trappings, he is a man mired in suffocating grief. You can understand the point he got to without getting there.
There& #39;s so much media, especially heavy media meant for adults, that have complex casts FULL of what one would call villains who are what they are because of problems. They& #39;re movies people relate to because the characters are in situations that mirror their own.