"Every villain is the hero of their own story" is true as far as it goes. But this does *not* mean, "Every villain needs to have sympathetic, relatable motivations."
The real world is full of people who just want to dominate, hurt and ruin others. They're the "heroes" in an ugly, terrible story.
One of my characters is "heroically" experimenting on children, trying to create supers without that annoying high fatality rate most empowering tech suffers from.
He knows that "supervillain" label the authorities stuck on him is just stupid people unable to understand his greatness. Maybe a few jealous rivals, too.
Yoko's Asterisk 🏳️⚧
D. G. Marshall