I almost never write villains who can be empathized or sympathized with. Nor do I write villains who complicate things as far as challenging the ethical standards held by the world at large. My villains are always irredeemable in both their means and their ends. They have evil goals and use evil means to achieve those goals, and that's because when I create villains, I don't do so with the intention of creating very nuanced characters with a lot of psychological, ideological and ethical complexity. Some of my villains may have that, but I never set out to do so.
When I create villains, I always do so with the intention of creating a sizable obstacle for heroic characters (and even other villainous characters). An obstacle that other characters will need to experience character growth in order to overcome. An example is Satar. He was an enormous obstacle for everyone. However, when he was finally overcome by a heroic character in Abigail, it was because she'd experienced character growth. She'd become more decisive and more confident. Of course, it also led to her undergoing character development because of the consequences that arose from her defeating Satar.